Statistics Class 9 Worksheet Maths Chapter 13

Multiple Choice Questions

Q1: For what value of n, the mode of the following data is 18?
2, 5, 3, 18, 5, 18, 6, 5, n, 7, 18
(a) 18
(b) 5
(c) It can be any value
(d) None of these

Q2: There are 150 numbers. Each number is subtracted from 60 and the mean of the numbers so obtained is found to be –4.5. The mean of the given numbers is
(a) 400
(b) 34.5
(c) 64.5
(d) 55.5

Q3: The median and mean of the first 10 natural numbers are,
(a) 5.5,5.5
(b) 5.5,6
(c) 5,6
(d) None of these

Q4: The following observations are arranged in ascending order :
20, 23, 42, 53, x, x + 2, 70, 75, 82, 96
If the median is 63, find the value of x.
(a) 62
(b) 64
(c) 60
(d) None of these

Q5: The mean of 20 observations was 60. It was detected on rechecking that the value of 125 was wrongly copied as 25 for computation of mean. Find the correct mean
(a) 67
(b) 66
(c) 65
(d) None of the above

Fill in the blanks

Q1: The mean of the data set (4 , 10 , 7 , 7 , 6 , 9 , 3 , 8 , 9 )  is ___________ (7/8/9)

Q2: The median of the above data set is _______ (7/8/9)

Q3: There are ______ Modes of the above given data set (1/2/3)

Q4: The range of the data set (78 , 65 , 68 , 72 , 70 , 76 , 74 , 62 , 80 , 82 , 96 , 101) is _______ (56/39/40)

Q5: The mean of five numbers is 40. If one number is excluded, their mean becomes 28.The excluded number is _____ (68/88)

True / False 

Answer the following Questions

Q1: The following data gives the amount of manure (in tones) manufactured by a company during some years.

• Represent it with a bar graph.
• Indicate with help of bar graph in which year, the amount of manufactured by company was maximum.

Q2: The following observations are arranged in ascending order:
26, 29, 42, 53, x, x + 2, 70, 75, 82, 93
If the median is 65, find the value of x

Q3: Mean of 50 observations was found to be 80.4. But later on, it was discovered that 96 was misread as 69 at one place. Find the correct mean.

The solutions of the worksheet "Worksheet Solutions: Statistics"