A histogram represents 200 observations. The intervals and frequency densities are

Interval	$0<x≤50<x\leq5$	$5<x≤155<x\leq15$	$15<x≤2015<x\leq20$	$20<x≤4020<x\leq40$
Frequency density	$a$	6	10	3

Estimate the number of observations with $x < 18$ .

A histogram represents 200 observations. The intervals and frequency densities are

Interval	$0<x≤50<x\leq5$	$5<x≤155<x\leq15$	$15<x≤2015<x\leq20$	$20<x≤4020<x\leq40$
Frequency density	$a$	6	10	3

Estimate the number of observations with $x < 18$ .

2 Statistics

2 Statistics Questions