The following is the frequency distribution for the speeds of a sample of automobiles traveling on...

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The following is the frequency distribution for the speeds of a sample of automobiles traveling on an interstate highway, Com

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Answer 1

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Speed Miles per hour	Frequency	Cumulative frequency	Relative frequency
50-55	2	2	0.06
55-60	4	6	0.11
60-65	5	11	0.14
65-70	10	21	0.29
70-75	9	30	0.26
75-80	5	35	0.14

$\sum f=2+4+5+10+9+5=35$

Mid point of the class	=	Lower class limit + Upper class limit 2
		2

Midpoint of third class	=	60+65
		2
	=	62.5

$Relative frequency = f/\sum f$

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Answer 2

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