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Organising Data

Find the mean...

Question

Find the mean of the data set given by the stem-and-leaf plot.

A

77

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B

74

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C

75

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D

68

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Solution

The correct option is C 75
The given stem-and-leaf plot is

The data set is

61, 64, 68, 74, 83, 86, 89

Mean = $\frac{s u m o f a l l d a t a}{n u m b e r o f d a t a}$

= $\frac{61 + 64 + 68 + 74 + 83 + 86 + 89}{7}$

= $\frac{525}{7}$

= 75

Hence, the mean of the data = 75.

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