Question

Explain your answer please and thankyou ​

Answer 1

11, 11, 48%

Explanation:

Mean=(sum of numbers)/(count of numbers)

1) 7.8=(5+8+x+12+3)/5

39=28+x

x=11

2) 12=(9+12+15+21+4+x)/6

72=61+x

x=11

3) 74.5=(91+77+56+x+76+61+98+89)/8

596=548+x

x=48%

Answer 2

1) 11

2) 11

3) 48°

Explanation:

7.8×5 = 5+8+x+12+3

x = 39 - 28 = 11

12×6 = 9+12+15+21+4+x

x = 72-61 = 11

74.5×8 = 91+77+56+x+76+61+98+89

x = 596 - 548 = 48°