Question

DAU HIEU	6	8	9	10
TAN SO	5	2	N	1

TIM N BIET SO TRUNG BINH CONG LA 6,6

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Answer 1

\(\dfrac{6.5+8.2+9.N+10.1}{5+2+N+1}=6.6\)

\(\dfrac{30+16+9.N+10}{8+N}=6.6\)

\(\dfrac{56+9.N}{8+N}=6.6\)

56+ 9N = 6.6. (8+N)

56+ 9N = 52.8- 6.6N

9N- 6.6N= 52.8- 56

2.4N = -3.2

N= -3.2\(\div\)2.4

N= \(\dfrac{-4}{3}\)

N\(\approx\)1.3