9th Maths statistics Quiz

Find the mean of (positive) factors of 48.

• 12

• 16

• 20

• 18

If the mean of the observations x, x + 3, x + 5, x + 7, x + 10 is 9, find x.

• 5

• 4

• 3

• 2

Find the median of the following data: 18, 37, 24, 59, 41, 26, 63, 45, 57, 29

• 47

• 37

• 41

• 45

If the arithmetic mean of 7, 9, 11, 13, x, 21 is 13, find the value of x.

• 17

• 15

• 19

• 23

The width of each of nine classes in a frequency distribution is 2.5 and the lower class boundary of the lowest class 10.6. Find the upper class boundary of the highest class.

• 33.1

• 40.6

• 35.6

• 38.1

The mean weight of 21 students of a class is 52 kg. If the mean weight of the first 11 students of the class is 50 kg and that of the last 11 students is 54 kg, find the weight of the 11th student.

• 48 kg

• 50 kg

• 52 kg

• 54 kg

The mean of five numbers is 27. If one number is excluded, their mean is 25. Find the excluded number.

• 24

• 22

• 20

• 26

For a mathematics test given to 15 students, the following marks (out of 100) are recorded: 41, 39, 48, 52, 46, 62, 54, 40, 96, 52, 98, 40, 52, 52, 60. Find the mean and mode of the given data.

• Mean: 54, Mode: 52

• Mean: 56, Mode: 52

• Mean: 52, Mode: 52

• Mean: 58, Mode: 52

The marks obtained by 40 students of a class in an examination are given. Present the data in the form of a frequency distribution using equal class size, one such class being 10-15 (15 not included).

• Option A

• Option B

• Option D

• Option C

In the first proof reading of a book containing 250 pages, the following distribution of misprints was obtained: Number of misprints (per page) - 0 1 2 3 4 5, Number of pages - 154 45 36 8 6 1. Find the average number of misprints.

• 2.0

• 2.5

• 1.5

• 3.0