The standard deviation would be 5.926400444
The average is 13.3 min
To test for normal distribution, we can look at the skew of the data. This is -0.988717886, which tells us that the data is skewed to the left, so on most days you did less then 13.3 minutes of dish washing. However, one day you did not do any dishes, which will definitely impact the data, which is seen as an outlier.

What if we took at day 4 ...

Solution Summary

This posting uses excel to calculate standard deviations. The excel worksheet is attached to the posting. It also looks at characteristics of the data such as is the distribution is normal (or is it skewed)? It also discusses the implications of having non-normal data.

... Compare your calculated values with ... Questions - Which formula does Excel use for calculating the sample variance and sample ... Use these values to calculate the z ...

... done using excel and showing how the answers were calculated. ... 8.56 This is calculating the PMT for an annuity ... We can also calculate the value directly by using ...

...Calculate F critical (cell I53) using the Excel FINV ... this solution describes, step by step, how to calculate the F ... d) variance, and (e) standard deviation 2, 2 ...

...deviations of each variable. x y Mean 41.95 245.3 Standard Deviation 18.2799142 130.6127664 Please see the excel spreadsheet. c) Working in Excel, calculate...

... For 9.14 a) the probability cannot be calculated because we ... is not known, we cannot calculate probability. Uses Excel for calculating probabilities in a Normal ...

Calculating the standard deviation,expected return,PV & PMT. ... What is the standard deviation for the XYZ returns? ... answer is B. Please refer attached Excel file. ...

... For calculating the standard deviation, go to an ... You may calculate the skewness of the distribution ... This solution shows how to calculate the mean and standard...

... predict the limits of expected variation by calculating the mean ... 2. Calculate the standard deviation for each. ... use Excel, or you may use a calculator or other ...

... Margin of error will be calculated as Upper Limit ... b. The population standard deviation is believed to be ...Calculate it using information from the output table Z ...