Question

The following observations have been arranged in ascending order, If the mean of the data is 13, Find the value of x: 3,6,7,10,x,x+4,19,20,25,28

Answer 1

Answer:

mean

$= \frac{sum \: of \: all \: observatins}{number \: of \: observations} \\ 13 = \frac{3 + 6 + 7 + 10 + x + x + 4 + 19 + 20 + 25 + 28}{10 } \\ 13 = \frac{122 + 2x}{10} \\ 13 \times 10 = 122 + 2x \\ 130 = 122 + 2x \\ 130 - 122 = 2x \\ 8 = 2x \\ \frac{8}{2} = x \\ x = 4(answer)$

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