Question

If the mean of numbers 28, x, 42, 78 and 104 is 62, what is the mean of 48, 62, 98, 124 and x?

Answer 1

78

Explanation:

Let's calculate the first mean:
`(28+x+42+78+104)/5=(x+252)/5=62`
From the last equality we can conclude that
`x+252=62*5`
and finally
`x=62*5-252=58`
Now, we can simply evaluate the second mean:
`(48+62+98+124+x)/5=`
`=(48+62+98+124+58)/5=390/5=78`