Do the different grades have much variation in salary

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Calculate the standard deviation. Do the different grades have much variation in salary?
8.A simple random sample of pages of my dictionary was collected. These are the number of words defined on each page. Find the mean, median, mode, and midrange.
53 79
There are 1459 pages. Estimate the total number of words in the dictionary. Is the estimate likely to be an accurate estimate of the total number of words in the English language?
9.I had 10 students last term who earned the following grades:98 85 89 73 76 85 87 92 85 56

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