Question

please solve this with explanation​

Answer 1

Answer:

mean = sum of all numbers/number of terms

= > mean = 6

= > (2 + 5 + a + 7)/4 = 6

= > 14 + a = 24

= > a = 10

The value is 10.

Answer 2

Arithmetic mean = Sum of all no.s ÷ no. of terms

So, (2 + 5 + a + 7)/4 = 6

= 6 × 4 = 14 + a

= 24 = 14 + a

= a = 24 - 14

= 10

So, a is 10.