Question

Find n so that mean of the data set is 140. (120, 145, 130, 80, 95, 100, 340, n)

Answer 1

Answer:

Answer: n is 110

Step-by-step explanation:

Formular:

$mean = \frac{ \sum(n_{1}, \: n _{2}, \: ...n_{n} ) }{n}$

therefore:

$140 = \frac{(120 + 145 + 130 + 80 + 95 + 100 + 340 + n)}{8} \\ \\ (8 \times 140) = 1010 + n \\ 1010 + n = 1120 \\ n = 1120 - 1010 \\ n = 110$