Question

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Answer 1

mean: add up and divide by 7
median: arrange from smallest to largest, take the middle one
mode: most frequent number (that is 21 because there are two of them)

Answer 2

huh?

Answer 3

Mean= (sum of all the numbers)/7
arrange the numbers in ascending order= 9, 17, 19, 20, 21, 21, 23
there are 7 terms, the third term which is the middle term is median= 20
Mode is the number which occurs most here 21 occurs twice so mode is 21
range is {9, 17, 19, 20, 21, 23} note that 21 which occurs twice , will be included only once in range.

Answer 4

Range will best represent this data set because we can get the complete description from it. Other measures will provide only partial information