San Diego State University Operations And Supply Chain Management Assignment Help - Standard

Question - 12 Students were given arithmatic test, and the times (in minutes) to complete it were as follows:
6,7,8,8,9,9,10,10,11,12,12,15
Determine:
a) the mean and median
b)the variance and standard deviation
c)the sixtieth percentile and the interquartile range
d) the proportion of observations falling within 2 standard deviations of the mean.
I understand how to do parts a,b and c, I would just like help with d.

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