Statistics Question Grouped Frequency Table Part 1

Dwayne

A survey shows the wages in dollars of a sample of 50 persons below in a table

 

30 20 26 40 15
25 33 38 37 36
6 15 39 32 39
36 26 40 28 29
40 14 3 7 25
16 13 8 8 22
37 11 17 1 18
40 9 18 2 21
28 24 19 3 8
14 33 23 16 10

 

a)      Construct a grouped frequency table using the classes 0-4, 5-9, 10-14, 15-19, 20-24, 25-29, 30-34 and 35-40.

b)      Calculate the probability that a person selected at random earned i) less than 20 dollars

ii) at least 20 dollars iii) at most 29 dollars

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