Ineed with question 3 ? not really sure how to go about it

The lengths from 32.1cm to 46.5cm covers 99.7% of this distribution.

Step-by-step explanation:

The 68-95-99.7 rule states that, for normally distributed measures:

68% of the values are within 1 standard deviation of the mean.

95% of the values are within 2 standard deviations of the mean.

99.7% of the values are within 3 standard deviations of the mean.

(a) What range of lengths covers almost all, 99.7%, of this distribution?

Those are those values within 3 standard deviations of the mean. So

From A to B, in which

The lengths from 32.1cm to 46.5cm covers 99.7% of this distribution.