In the testing phase of golf b***s, manufacturers generate robot controlled shots and analyse the results of such shots by the flight distance which is measured to a high accuracy.
It was found that the mean length of a large number of robot controlled shots using the Titleist Pro V1x golf ball is 229.424 metres and the standard deviation is 15.953 metres.Assuming that the lengths are normally distributed, find the proportion of robot controlled shots that measure between 224 and 265 metres. Supply your answer correct to three decimal places
For this one you first need to enter 265 in the top box and leave the second box empty then press calculate to get:
Now clear the second box and enter 224 in the top box and press calculate to get:

Take the difference between 0.98713 and 0.36693 to get the required proportion; namely 0.620 (to 3 dp).