CLASS-8

BOARD: CBSE

Mathematic Worksheet - 11

TOPIC: Statistics

For other **CBSE Worksheet for class 8 Mathematic **check out main page of Physics Wallah.

**OBJECTIVE:**

**Directions (Q.1 – Q.5): following graph shows the marks obtained by students in various subjects out of 100 marks. With the help of following graph answer the questions given below:**

**1. At what subject is the student sharp?**

(A) English

(B) Mathematics

(C) Science

(D) History

**2. In which subject is the student poor?**

(A) English

(B) Mathematics

(C) Science

(D) History

**3. What are the average marks obtained by the student?**

(A) 57

(B) 63

(C) 80

(D) 48

**4. What is the percentage marks obtained by the student?**

(A) 80%

(B) 63%

(C) 57%

(D) 90%

**5. What is the ratio of the highest marks to the lowest marks obtained by the student?**

(A) 2:11

(B) 9:2

(C) 2:9

(D) 11:2

**6. The mean of 6, y, 7, x and 14 is 8, then.**

(A) x + y = 13

(B) x – y = 13

(C) 2x + 3y = 13

(D) x^{2}+y^{2}=15(π/6)

**7. If the mean of x and 1/x is M, then the mean of and 1/ is:**

(A) M^{2}

(B) M^{2}/2

(C) 2M^{2 -2}

(D) 2M^{2 -1}

**8. The mean of first 10 natural numbers is:**

(A) 5/2

(B) 11/2

(C) 13/2

(D) 5

**9. The mean of first five prime numbers is:**

(A) 3

(B) 3.6

(C) 7

(D) 5.6

**10. The average age of group of eight members is the same as it was 3 years ago, when a young member is substituted for an old member. The incoming member is younger to the outgoing member by:**

(A) 11 years

(B) 24 years

(C) 28 years

(D) 16 years

**11. Following table shows the weight of 12 students.**

Weight (in kgs) | 67 | 70 | 72 | 73 | 75 |

Number of student | 4 | 3 | 2 | 2 | 1 |

The mean weight is:

(A) 70.36

(B) 70.89

(C) 70.25

(D) None of these

**12. Following are the marks of 30 students in a class, then the frequency of students having marks 22 is:**

20, 22, 22, 25, 26, 26, 0, 10, 0, 25, 22, 23, 22, 24, 22, 24, 25, 23, 21, 25, 28, 29, 30, 27, 22, 24, 22, 25, 0, 10.

(A) 4

(B) 5

(C) 6

(D) 7

**13. A cricketer has a certain average runs for 10 innings. In the 11 ^{th} inning, he scores 100 runs, now his average is increased by 9 runs. Then average of 11 innings is:**

10runs

(B) 20 runs

(C)11 runs

(D) 21 runs

(B) 4

(C)17

(D) 8

1) B

2) D

3) A

4) C

5) B

6) A

7) C

8) B

9) D

10) B

11) C

12) D

13) A

14) A