Thread: statistic (2)

The number of personal computers sold in a week by a computer for a period of 25 weeks is given as follows .

10 8 7 4 4 18 9 14 17 11 5 4 5 7 10 12 14 10 9 29 7 6 5 20 15

Find the percentage of the weeks that the weekly sales of the personal computers are within one standard deviation from the mean .


I don understand what the questino is asking .THanks for the help .

Originally Posted by thereddevils

The number of personal computers sold in a week by a computer for a period of 25 weeks is given as follows .

10 8 7 4 4 18 9 14 17 11 5 4 5 7 10 12 14 10 9 29 7 6 5 20 15

Find the percentage of the weeks that the weekly sales of the personal computers are within one standard deviation from the mean .


I don understand what the questino is asking .THanks for the help .

Calculate the mean of the data. Calculate the standard deviation of the data. Calculate the interval [mean - sd, mean + sd]. Count how many data lie in this interval. Convert the number you counted into a percentage out of 25.

Originally Posted by mr fantastic

Calculate the mean of the data. Calculate the standard deviation of the data. Calculate the interval [mean - sd, mean + sd]. Count how many data lie in this interval. Convert the number you counted into a percentage out of 25.

understood , thanks a lot .