Intervals are given to us
19, 19, 27, 20, 27, 26, 25, 26, 18, 27, 20, 24, 19, 21, 27, 23, 21, 17, 22, 22
From the given data we need to create a frequency table
From 17 - 19 there are 5 numbers. they are 19,19,19, 18, 17
From 20 -22 there are 6 numbers . they are 20, 20, 21, 21, 22, 22
From 23 - 25 there are 3 numbers. they are 23, 24, 25
From 26 to 28 there are 6 numbers . they are 27, 27, 26, 26, 27, 27
Histogram is attached below