A group of people were surveyed about the number of WhatsApp messages

they send per day.

48 40 65 35 42 12 18 102 63 55

43 38 27 50 68 55 43 80 74 35

33 45 72 16 49 5 58 50 48 39

1.1 Calculate the mean of this data set. (2)

1.2 Calculate the standard deviation of this data set. (2)

1.3 What percentage of data values are within one standard deviation of the

mean?

(3)

1.4 How many observations are within two standard deviations of the mean.

asked by guest
on Nov 15, 2024 at 8:51 am



Mathbot Says...

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