The document Very Short Answers Type Questions- Statistics Class 9 Notes | EduRev is a part of the Class 9 Course Mathematics (Maths) Class 9.

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**Question 1. The marks obtained by 17 students in a mathematics test (out of 100) are given below: 48, 66, 68, 49, 91, 72, 64, 46, 90, 79, 76, 82, 65, 96, 100, 82, 100 Find the range of the data. Solution: **Lowest observation = 46

Highest observation = 100

âˆ´ Range = 100 â€“46 = 54

**Question 2. The class-mark of the class 130 â€“ 150 is: Solution: Class-mark = ((130+150)/2) = (280/2) = 140**

**Question 3. The median of the following numbers arranged in descending order is 25. Find the value of x: 40, 38, 35, 2x + 10, 2x + 1, 15, 11, 8, 5 Solution: **Number of observations = 9

âˆ´ The median is the ((n+1)/2)th term i.e. ((9+1)/2) th or the 5^{th} term.

â‡’ 2x + 1 = 25

â‡’ x= (25-1)/2= 12

**Question 4. If the mean of 6, x, 4, and 12 is 8, then find the value of x. Solution: **

âˆ´ = 8 or 22 + x = 32

or x = 32 â€“ 22 = 10

**Question 5. Find the range of the data 9, 7, 5, 7, 9, 9, 6, 18, 9 and 8. Solution: ** Highest data = 18

Lowest data = 5

â‡’ Range = 18 â€“ 5 = 13

**Question 6. Calculate the median of : 152, 155, 160, 144, 145, 148, 147, 149, 150 Solution**: Writing the given data in ascending order, we get: 144, 145, 147, 148, 149, 150, 152, 155, 160

Here, n = 9

âˆ´ Median = term = term = 5^{th} term

â‡’ Median = 149

**Question 7. What is the median of 70, 40, 50, 100, 75, 75, 65 and 95? Solution:** In ascending order, the given data is:

40, 50, 65, 70, 75, 75, 95, 100

Here, n = 8 (Even number)

â‡’ Median =

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