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1. Study the table and answer the questions.
Average height (in cm) of the girls whose heights are 155 cm and above is about-
Multiply them by their respective frequency and then divide by total no. of girls.
| Height (in cm.) | Numbers of Girls |
| Less than 140 Less than 145 Less than 150 Less than 155 Less than 160 Less than 165 | 4 11 29 40 46 51 |
Average height (in cm) of the girls whose heights are 155 cm and above is about-
Solution:
Take value of class interval 155 - 160 and 160 - 165 i.e. 157.5 and 162.5.Multiply them by their respective frequency and then divide by total no. of girls.