Answer:
Step-by-step explanation:
Mean is calculated by total sum divided by number
14 = 13+15+15+ a+15 +11/6,
The missing value is given as a;
14 = 69 + a /6
We cross multiply:
69 + a = 14 x 6
69 + a = 84
Subtract 69 from both sides to get the value of a
69 + a - 69 = 84 - 69
a = 15
