Question

A set of five observations is given. The average of first 4 observation is 15 and that of the last 4 observations is 17. The first observation is 16 then find the last observations​

Answer 1

Answer:

Last observation is 24

Step-by-step explanation:

Let five observation be a, b, c, d, e

a=16

The average of first 4 observation is 15

$\frac {a+b+c+d}{4}=15\\a+b+c+d=60\\b+c+d=60-16\\b+c+d=44$

Average of last 4 observation is 17 ie

$\frac {b+c+d+e}{4}=87\\b+c+d+e=68\\e=68-44\\e=24$

Last observation is 24