Mathematics

Problem

A horticulturalist takes a random sample of six month old seedlings from a nursery and measures their heights. The results are shown in the table.

Height ( $h$ mm)	Frequency
$300 \le h < 325$	12
$325 \le h < 350$	18
$350 \le h < 375$	42
$375 \le h < 400$	28
$400 \le h < 425$	14
$425 \le h < 450$	6

a. Display the data on a frequency histogram. b. How many of the seedlings are 400 mm or higher? c. What percentage of the seedlings are between 350 mm and 400 mm high? d. In total there are 1462 seedlings in the nursery. Estimate the number of seedlings which measure: i less than 400 mm ii between 375 and 425 mm.

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