CBSE Class 9 Mental Maths Statistics Worksheet

Question. For which of these groups of numbers is the AVERAGE an EVEN number?
A. 10, 11, 12, 13
B. 23, 25, 27, 29
C. 20, 30, 40, 50
D. 1, 2, 3, 4, 5, 6
Answer : B

Question. A player's Batting Average is calculated as the total number of runs scored (in all innings) divided by the number of times the player has been out. What is Rahul's batting average in test cricket?
A. 22.3
B. 27
C. 1530
D. Data is insufficient

Answer : D
 

Question. For the class interval 21-25, what is the upper limit?
Answer : 25

Question. What is the class mark for the class interval 18-26?
Answer : 22

Question. What is the range for the given data :-
31, 32.5, 20.3, 27.9, 28, 19.7, 31.7.
Answer : 12.8

Question. If the Tally marks of a given data is then what is its frequency.
Answer : 9

Question. Given below is the no. of goals made by a team in 10 matches :-
Answer : 2.8

Question. Find the median for the above Q. 5
Answer : 3

Question. 2, 3, 4, 5, 0, 1, 3, 3, 4, 3 find the mode for the given data.
Answer : 3

Question. Find the mode for the data given below :-
14, 25, 14, 28, 18, 17, 14, 23, 22, 14, 18.
Answer : 14

Question. If the mean of 6, 8, 5, 7, x and 4 is 7 then find the value of x.
Answer : 12

Question. If the mean for 10 observations is 20 and mean for other 15 observation is 16 then find the mean for all 25 observations.
Answer : 17.6

Question. Find the mean for :-
4, 3, 7, 0, 0, 6, 8.
Answer : 4

Question. Find the mode for the following :-
7, 9, 12, 13, 7, 12, 15, 7, 12, 7, 25, 18, 7.
Answer : 7

Question. The mean for three nos. is 6. If two of them are 5 & 8 respectively then find the third number.
Answer : 6

Question. If means of 1 x , 2 x is 6 and mean of 1 x , 2 x and 3 x is 7 then find 3 x .
Answer : 9

Question. Find the mean of first three natural numbers.
Answer : 2

Question. If 3 is the mean for x, 3, 4, 5 then find the value of x.
Answer : 0

Question. Find the mean for first three whole numbers.
Answer : 1

Question. What is the mean of p, q and r.
Answer : p + q + r / 3

Question. The mean of 4, 4, 3, 5, 6, 2, is ____.
Answer : 4

Question. One student has scored the marks in five subject as below :-
70, 64, 56, 54, 51. find the mean.
Answer : 59

Question. For which value of p, the data given below has mode 5.
1, 2, 5, 7, 5, 2, 7, 5, 9, 2, 3, p, 11
Answer : 5

Question. Find the median :-
36, 39, 42, 48, 52, 68, 69, 71, 72, 78.
Answer : 60

Question. The class marks are given below :-
47, 52, 57, 62, 67, 72, 77, 82
What is the class size?
Answer : 6

Question. Find the class limit for the first class marks of above Q.
Answer : 44.5-49.5

Question. What is the range of 40, 42, 80, 69, 56, 47?
Answer : 40