RD Sharma Class 9 Solutions Chapter 24 Exercise 24.2 (Updated 2021-22)

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• RD Sharma Class 9 Maths Solutions

Download RD Sharma Class 9 Solutions Maths Chapter 24 Exercise 24.2

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Access RD Sharma Class 9 Solutions Maths Chapter 24 Exercise 24.2

Question 1: Calculate the mean for the following distribution:

Solution:

Formula to calculate mean:

= 281/40

= 7.025

⇒ Mean for the given distribution is 7.025.

Question 2: Find the mean of the following data:

Solution:

Formula to calculate mean:

= 2650/106

= 25

⇒ Mean for the given data is 25.

Question 3: The mean of the following data is 20.6 .Find the value of p.

Solution:

Formula to calculate mean:

= (25p + 530)/50

Mean = 20.6 (Given)

So,

20.6 = (25p + 530)/50

25p + 530 = 1030

25p = 1030 − 530 = 500

or p = 20

⇒ The value of p is 20.

Question 4: If the mean of the following data is 15, find p.

Solution:

Formula to calculate mean:

= (10p + 445)/(p + 27)

Mean = 15 (Given)

So, (10p + 445)/(p + 27) = 15

10p + 445 = 15(p + 27)

10p – 15p = 405 – 445 = -40

-5p = -40

or p = 8

⇒ The value of p is 8.

Question 5: Find the value of p for the following distribution whose mean is 16.6.

Solution:

Formula to calculate mean:

= (24p + 1228)/100

Mean = 16.6 (given)

So, (24p + 1228)/100 = 16.6

24p + 1228 = 1660

24p = 1660 – 1228 = 432

p = 432/24 = 18

⇒ The value of p is 18.

Question 6: Find the missing value of p for the following distribution whose mean is 12.58.

Solution:

Formula to calculate mean:

= (7p + 524)/50

Mean = 12.58 (given)

So, (7p + 524)/50 = 12.58

7p + 524 = 12.58 x 50

7p + 524 = 629

7p = 629 – 524 = 105

p = 105/7 = 15

⇒ The value of p is 15.

Question 7: Find the missing frequency (p) for the following distribution whose mean is 7.68.

Solution:

Formula to calculate mean:

= (9p + 303)/(p+41)

Mean = 7.68 (given)

So, (9p + 303)/(p+41) = 7.68

9p + 303 = 7.68 (p + 41)

9p + 303 = 7.68p + 314.88

9p − 7.68p = 314.88 − 303

1.32p = 11.88

or p = (11.881)/(1.32) = 9

⇒ The value of p is 9.

We have included all the information regarding CBSE RD Sharma Class 9 Solutions Chapter 24 Exercise 24.2. If you have any query feel free to ask in the comment section. 

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