Điểm kiểm tra toán HKI của các bạn học sinh lớp 7a được thống kê theo bảng 1 sau: Điểm (x) 4 5 6 7 8 9 10 Tần số(n) 1 4 15 14 10 5 1 N=50 1) Dấu hiệu điều tra là: A . Điểm kiểm tra toán HKII của lớp 7a B. Điểm kiểm tra toán 1 tiết của lớp 7a C. Điểm kiểm tra toán HKI của mỗi bạn học sinh lớp 7a . 2) Tần số của điểm 5 ở bảng 1 là: A. 4 B. 14 C. 10 . D. 1. 3) Mốt của dấu hiệu điều tra ở bảng 1 là: A . 4 B. 5 C. 6 . D. 7. 4) Số trung bình cộng của dấu hiệu điều tra ở bảng 1 là: A . 6,94 B. 6,0 C. 6,91 D . 6,9 5) Số các giá trị của dấu hiệu là : A. 20 B. 30 C. 40 D . 50 6) Số các giá trị khác nhau là : A. 6 B. 7 C. 8 D.. 7) Tần số 10 là của giá trị : A. 9 B. 8 C. 10 . D. 6. 8) Tổng tần số của dấu hiệu là : A. 40 B. 50 C. 60 . D. 20. 9) Điểm kiểm tra thấp nhất là : A. 1 B. 2 D. 4. 10) Điểm kiểm tra cao nhất là A. 7 B. 8 C. 9 . D. 10

( cả hai bài đề là true or false nhé :))) bài 1: Nobody knows exactly how many different languages there are in the world. There are probably about two thousand. From these two thousand languages, the United Nations has chosen only six of them for business. They are Arabic, Chinese, French, Russian, Spanish and English. Among these six languages English is the most widely used. It is the language of business, sea and air, sports and science. So it is important to learn English. But it is quite hard for me to master this language. At first, I find that English is very interesting. Soon, I feel that it is not easy to learn. English is very different from Vietnamese as its grammar is rather difficult. To better my skills, I spend a lot of time listening to the tapes or the radio, speaking the language with my teachers and friends, reading books, magazines and newspapers. I practise writing my diary in English too. I’m not afraid of making mistakes. All in all, many people think the best way to learn a foreign language is to use it every day. 1. About three thousand different languages are used in the world. 2. Six official languages have been chosen for business by the UN. 3. English is the language of business, sea, air, sports and science. 4. According to the author, English grammar is not as difficult as Vietnamese grammar. 5. It is thought that the most effective way to master a foreign language is to use it every day. bài 2. Read the passage and decide whether the following statements are true (T), false (F) or not given (NG) Mandela was born in a small village in South Africa. He grew up in a poor family, and he was the first child in the family to go to school. He became interested in politics and was forced to leave his first university for protesting. At the time, South Africa suffering from apartheid, which meant that the black and white residents of South Africa were separated from each other. People had to carry identity cards with their race on it. Black and white people were not allowed to get married to each other. Mandela witnessed all this and decided to fight against it. He joined a rebel group which attacked government and rnilitary targets. He was arrested in 1962 and put into prison for the next 27 years. During these 27 years, Nelson Mandela lived in a prison cell on a small island. He had to work very hard like other prisoners. It was such a horrible life for a great man. However, when he was in prison, people began to find out more about his struggles for democracy and justice. When he was released in 1990, he was a worldwide hero. He continued to fight against the ruling government. Eventually, in 1994 his struggles were successful, and Nelso Mandela became the first democratically elected president of South Africa. Apartheid no longer exists. 1. Nelson Mandela was born and grown up in a rich family 2. He was forced to leave his first university because he was a lazy student 3. Black and white people of South Africa were not equal in the past 4. Nelson Mandela became the President of South Africa in 1994 5. Nelson Mandela finally got married to a black woman.

khi hiện tượng nhật thực sảy ra có 2 người đứng ở hai nơi trên TĐ .1 người cho rằng đã xảy ra hiện tượng nhật thực toàn phần người kia lại cho là xảy ra hiện tượng nhật thực 1 phần?Vì sao?

giúp mik vs Hai tỉnh A và B cách nhau 42km. Một chiếc tàu đi từ tỉnh nọ đến tỉnh kia. Khi đi ngược dòng sông từ A tới B thì vận tốc của nó nhỏ hơn vận tốc lúc xuôi dòng là 4km/h. Tính vận tốc của chiếc tàu khi xuôi dòng và khi ngược dòng, biết rằng thời gian ngược dòng nhiều hơn thời gian xuôi dòng là 1 giờ 12 phút.

. Các phân tử ARN đều được tổng hợp từ (I) và sau đó thực hiện chức năng ở (II) số ( I) và số (II) lần lượt là : a. Nhân , nhân b. Nhân , tế bào chất c. Tế bào chất , Tế bào chất d. Tế bào chất , nhân

Giúp mình bài này với mai mình phải nộp rùi huhu

Cho tam giác ABC cân tại A, M là trung điểm của BC. Gọi H,K lần lượt là trung điểm của AB,AC. Chứng minh HK//BC. Gọi I là trung điểm của HK. Chứng minh A,I,M thẳng hàng

bài này con k biế làm xin cô cứu con giải

Cho hàm số y = 2mx + m +1 (1) và y = (m - 1)x + 3 (2) a) Xác định m để hàm số 1 đồng biến hs 2 nghịch biến b) Xác định m để đồ thị hs // với nhau c) CM rằng đồ thị (d) của hs 1 luôn đi qua 1 điểm cố định với mọi giá trị của m

I. Choose the right word in brackets to fill in the blank. 1. Last night I watched the movie Romeo and Juliet. At last they killed..............................(together/ each other/ themselves/ them). 2. (What/ Do/ Would/ Will) ............. you like to come? – I‟d love to. 3. We must be there ............................ (at/ before/ between/ after) 7.30 and 8.15. 4. When my grandmother was young, she used ..................... (sing/ to sing/ sang/ sung) very well. 5. Don‟t go .................... (outside/ inside/ into/ away). It's too cold. 6. Our team played well ........................... (too/ that/ so/ enough) to win the gold medal. 7. Don‟t let your child ........................ (play/ to play/ playing/ plays) with matches. 8. How long will he ................. (must/ should/ have to/ has to) stay there? 9. Our team won the game because we played very .................. (good/ well). 10. I tried on the shoes and they fitted me ................ (perfect/ perfectly). 11. He had an accident because he was driving too ................ (fast/ fastly). 12. Tom is a ....................... driver (careful/ carefully). He is driving along the narrow road. (careful/ carefully) 13. Do you usually feel ................... (nervous/ nervously) before examination? 14. She speaks English ................................... (fluent/fluently). 15. He hurt himself ................ (bad/badly). 16. He looked me .............. when I interrupted him. (angry/ angrily) 17. I always feel ............. when the sun is shining. (happy/ happily) 18. Lan worked very .................... for the exam. (hard/ hardly) 19. I am not ........................................ at Math. (good/ well) 20. My aunt speaks English very ............... (good/ well/ goodly/ best). 21. We have math on Tuesday, Thursday and Friday; it means we have math ................. (once/ twice/ three times/ four times) a week. 22. Lan promises to ............................. (try/ make/ work/ learn) her best in learning English.