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The data 30, 33, 49, 51, x, x + 4, 73, 79, 85, 96 is arranged in the ascending order and median of the class is 64. Find the value of x.
Question

The data 30, 33, 49, 51, x, x + 4, 73, 79, 85, 96 is arranged in the ascending order and median of the class is 64. Find the value of x.

A.

62

B.

64

C.

61

D.

63

Correct option is A

Given
Data set: 30, 33, 49, 51, x, x + 4, 73, 79, 85, 96
Total number of terms (n) = 10
Formula Used
For an even number of observations, Median = Average of the n2 \frac{n}{2}​th and (n2+1) (\frac{n}{2} + 1)​th terms.
Solution
Since n = 10 (even), the median is the average of the 5th and 6th terms.
5th term = x
6th term = x + 4
Median =  x+(x+4)2\frac{x + (x + 4)}{2}​​
2x+42=64 x+2=64x=642x=62\frac{2x + 4}{2} = 64 \\\ \\x + 2 = 64 \\x = 64 - 2\\x = 62\\​​
Final Answer
So the correct answer is (a)

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