Question

Arithmetic mean of these items 10,15,x,20,30,is 20.found out the missing item​

Answer 1

Answer: mean = 10+15+20+30+x/5

20×5=75+x

100 - 75 = x

25 = x

In Statistics,arithmetic mean or average is calculated as the sum of all the numbers or observations in a series or data set divided by the total number of items or observations in the series or data set.

In this case,the numbers or observations in the series are 10,15,x,20 and 30 and the arithmetic mean or average is 20.

Therefore,based on the formula of arithmetic mean or average,we can state:-  

[ 10 + 15 + x + 20 + 30 ] / 5 = 20

75 + x = 100

x = 100 -75

x = 25

The missing item or number in the data set or series is 25.

Explanation:  PLEASE MAKE ME TTHE BRAINLEIST

Answer 2

missing number is 25

hope it's helpful