Question 171181
you are correct about the mean and the mode.
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 the median however is found by taking the middle value from an ascending order of numbers.  349+363/2=356  we had to take the 4th and 5th terms and average them since there is an even number in the group.
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standard deviation takes some work but does have a formula
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for this group it is 243.67



standard deviation ={{{sum( sqrt((x[i]-mean)^2/n), 1,n)}}}where {{{x[i]}}} is each term in the group and n is the number of terms in the group