Question

If the average (arithmetic mean) of the four numbers 3 15 32 and (n + 1) is 18 then n =

Answer 1

Answer:

n = 21

Step-by-step explanation:

Average = Sum of observations ÷ No. of observations

Sum of observations = Average * No. of observations

The four numbers are: 3, 15, 32 and (n+1)

Sum of four numbers = (51 + n)

Average of four numbers = (51 + n) ÷ 4

We are given that average = 18

=> (51 + n) ÷ 4 = 18

=> (51 + n) = 72

=> n = 21

Thus, the four numbers are: 3, 5, 15 and 22