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olga nikolaevna [1]
3 years ago
13

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

Mathematics
2 answers:
Delvig [45]3 years ago
8 0

Answer:

<u>Answer</u><u>:</u><u> </u><u>n</u><u> </u><u>is</u><u> </u><u>1</u><u>1</u><u>0</u>

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

Varvara68 [4.7K]3 years ago
5 0

Answer:

we know that mean of the data set is

Sum of all terms / total no. of terms

mean = 120+145+130+80+95+100+340+n / 8

140 = 1010+n / 8

140*8 = 1010 + n

1120 = 1010 + n

1120 - 1010 = n

110 = n

therefore the value of n should be 110

hope it's helpful

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