Mean is another word for average.
To find the mean , add the terms, then divide by the number of terms.
Hence
[21 + 25 + 36 + 16 + 32] / 5
130/5 =
26 The mean value.
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25 + 16 - 13 - 21 = 7
Mode is the most frequent. Sorting to make it easier to see the frequency of the numbers: {13, 16, 17, 21, 25, 25, 30} - 25 appears twice and every other number once. Thus: mode of the numbers is 25.
22
When put in order, the numbers are: 16, 18, 24, 25, 26, 27, 31, 32 and 2123. The median is the middle number, which is 26. If you mean the 2123 to be 21 and 23, then the numbers are: 16, 18, 21, 23, 24, 25, 26, 27, 31 and 32. In this case, there is an even amount of numbers, so the median is the value halfway between the two middle numbers. They are 24 and 25, so the median is 24.5 as your answer.
21 is not the square of an integer. The closest square number is 25.