Question

17. The arithmetic mean of 10 items is 4 and the arithmetic mean of 5 items is 10. The combined arithmetic mean is: (A) 4 (B) 5 (C) 6 (D) 90​ka answer kya h

Answer 1

Answer:

the correct answer is

Explanation:

Combined mean = 6.42 (Approx)

Amount is payable as 7 2 on application, * 5 on allotment and = 3 on first and final call

THE CORRECT ANSWER IS 5

Answer 2

Given : The arithmetic mean of 10 items is 4 and the arithmetic mean of 5 items is 10.

To Find : The combined arithmetic mean

(A) 4 (B) 5 (C) 6 (D) 90​

Solution:

$\text{Mean}=\frac{\text{sum of all the obervations}}{\text{number of the observations}}$

The arithmetic mean of 10 items is 4

Sum of 10  Items = 10 * 4 = 40

The arithmetic mean of 5 items is 10

Sum of 5  Items = 5 * 10= 50

Total Observations/ items = 10 + 5 = 15

Sum of 15 items = 40 + 50 = 90

The combined arithmetic mean  = 90/15  = 6

Correct option is C) 6

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