Fiona has to plot a histogram of the given data.

82, 83, 89, 67, 65, 88, 66, 69, 83, 81, 94, 68, 82, 69, 86, 83, 88, 62, 64, 93

which frequency table should she use for the histogram?
a.
interval 60-70 70-80 80-90 90-100
frequency 8 0 10 2
b.
interval 56-63 63-70 70-77 77-84 84-91 91-98
frequency 1 7 0 5 5 2
c.
interval 50-70 70-80 80-85 85-90 90-100
frequency 8 0 6 4 2
d.
interval 60-75 75-90 90-105
frequency 8 10 2