1) Which of the following is true for a histogram? a) It displays categorical data b) Bars do not touch each other c) Bars touch each other and there are no spaces between the bars d) The width of the bars is the same 2) In the histogram shown, the frequency of the interval  20-35 is a) 16 b) 18 c) 30 d) 40 3) In the histogram shown, the frequency density of the interval 10-20 is a) 0.4 b) 1.0 c) 1.2 d) 1.8

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