find the mean and standard deviation of the sample of housefly wing lengths

list all the data values that are within 2 standard deviations of the mean. justify how you obtained those data values.

what percentage of the data values are within 2 standard deviations of the mean? show work for the calculation.

is this consistent with the empirical rule
 
 
 

In 1955, scientists R.R. Sokal and P.E. Hunter analyzed the affects of pesticides on houseflies. Among the data sets they collected were samples of housefly wing lengths. These are normally distributed. The data they collected is summarized in the following frequency distribution. Normally Distributed Housefly Wing Lengths length (x.1mm) frequency 36 1 37 1 38 2 39 2 40 40 4 41 42 6