For each of the given the data sets below, calculate the mean, variance, and standard deviation.

(a) $\ 94, \ 72, \ 60, \ 78, \ 88, \ 80, \ 39, \ 62, \ 23$
mean $=$ variance $=$ standard deviation $=$

(b) $\ 50, \ 57, \ 46, \ 52, \ 55, \ 40$
mean $=$ variance $=$ standard deviation $=$

(c) $\ 2.8, \ 4, \ 3.4, \ 3.6, \ 4.9$
mean $=$ variance $=$ standard deviation $=$

Your overall score for this problem is