EASY
9th ICSE
IMPORTANT
Earn 100

The mean of 25 observation is 27. If one observation is included, the mean still remains 27. Find the included observation.

Important Questions on Statistics

MEDIUM
9th ICSE
IMPORTANT
Understanding ICSE Mathematics Class 9>Chapter 20 - Statistics>EXERCISE 20.1>Q 9

The mean of 5 observation is 15. If the mean of the first three observations is 14 and that of the last three is 17, find the third observation.

EASY
9th ICSE
IMPORTANT
Understanding ICSE Mathematics Class 9>Chapter 20 - Statistics>EXERCISE 20.1>Q 10
The mean of 8 variates is 10.5. if seven of them are 3,15,7,19,2,17 and  8, then find the 8th variate.
MEDIUM
9th ICSE
IMPORTANT
Understanding ICSE Mathematics Class 9>Chapter 20 - Statistics>EXERCISE 20.1>Q 11
The mean weight of 8 students is 45.5 kg. Two more students having weights 41.7kg and 53.3kg join the group. What is the new mean weight?
EASY
9th ICSE
IMPORTANT
Understanding ICSE Mathematics Class 9>Chapter 20 - Statistics>EXERCISE 20.1>Q 12
Mean of 9 observations was found to be 35. Later on , it was detected that an observation 81 was misread as 18. Find the correct mean of the observations.
HARD
9th ICSE
IMPORTANT
Understanding ICSE Mathematics Class 9>Chapter 20 - Statistics>EXERCISE 20.1>Q 13
A student scored the following marks in 11 questions of a question paper: 7, 3, 4, 1, 5, 8, 2, 2, 5, 7, 6. Find the median marks.
MEDIUM
9th ICSE
IMPORTANT
Understanding ICSE Mathematics Class 9>Chapter 20 - Statistics>EXERCISE 20.1>Q 14

Calculate the mean and the median of the numbers :-

                    2,3,4,3,0,5,1,1,3,2.
MEDIUM
9th ICSE
IMPORTANT
Understanding ICSE Mathematics Class 9>Chapter 20 - Statistics>EXERCISE 20.1>Q 15

A group of students was given a special test in Mathematics. The test was completed by the various students in the following time in (minutes):

                       24,30,28,17,22,36,30,19,32,18,20,24.

Find the mean time and median time taken by the students to complete the test.
MEDIUM
9th ICSE
IMPORTANT
Understanding ICSE Mathematics Class 9>Chapter 20 - Statistics>EXERCISE 20.1>Q 16
In a Science test given to a group of students, the marks scored by them (out of 100) are 41, 39, 52, 48, 54, 62, 46, 52, 40, 96, 42, 40, 98, 60, 52. Find the mean and median of this data.