Question

1. The average of 7, 11, 15,X, 14, 21, 25 is 15, then the value of x is
(a) 3
(b) 12
(c) 13.3
(d) 14.5​

Answer 1

Answer:

Answer is (b)12

Step-by-step explanation:

Mean = Sum of observations/number of observations

15= 7+11+15+14+21+25+x/7

15=93+x/7

15 multiply 7= 93+x

105=93+x

x=105-93

x=12

Answer 2

Answer: 12

Step-by-step explanation: 7+11+15+14+21+25+x ÷ 7 = 15

93+x / 7 = 15

93 + x = 15 × 7

X = 105 - 93

X = 12