Mathematics

Problem

During a science project, the heights of 100 newly planted saplings (to the nearest centimetre) were measured and grouped as shown below: a. (a) Compute the average height of a sapling using the information given.

Height (cm)	18–22	22–26	26–30	30–34	34–38	38–42
Number	7	12	23	27	18	13

b. (b) After one month, each sapling had grown exactly 2 cm. Without drawing a new table from scratch, determine the new average height of the saplings. Show clearly how you arrive at your answer.

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