# 10th Maths Chapter 8 Statistics and Probability Exercise 8.2

10th Standard Maths Chapter 8 Statistics and Probability Exercise 8.2 Guide. TN SSLC Samacheer Kalvi Guide Chapter 8 Exercise 8.2 Book Back Answers & Solutions. 10th All Subject Guide – Click Here. Class 1 to 12 All Subject Book Back Answers – Click Here.

### 1. The standard deviation and coefficient of variation of data are 1.2 and 25.6 respectively. Find the value of the mean.

Solution:
Co-efficient of variation C.V. = $$\mathrm{C.V}=\frac{\sigma}{\overline{x}} \times 100$$

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### 8. The mean and standard deviation of marks obtained by 40 students of a class in three subjects Mathematics, Science, and Social Science are given below.

Which of the three subjects shows the highest variation and which shows the lowest variation in marks?
Solution:

Science subject shows the highest variation. Social science shows the lowest variation.

### 9. The temperature of two cities A and B in the winter season are given below.

Find which city is more consistent in temperature changes?
Solution:

∴ Co-efficient of variation of City A is less than the C.V of City B.
∴ City A is more consistent.