The frequency table gives information about the ages of 60 people.
Age x (years) Frequency Cumulative frequency
0 < x ≤ 10 10 a
10 < x ≤ 20 14 b
20 < x ≤ 40 17 c
40 < x ≤ 60 8 d
60 < x ≤ 75 11 e
Work out the missing values a to e.
a=
b=
c=
d=
e=
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