Question

the museum of science in boston has an exhibit in which metal balls drop down a chute, bounce around and wind up in one of 21 bins. After 1000 balls have been dropped, the heights within the bins clearly follow a bell-shaped curve. If the standard deviation is 3 bins, approximately how many balls are in bins 1 through 7?

Answer 1

i If there given options are different than our answer than use nearest answer in your options.

For example : options are 100,200,300,400

And our answer is 92, then nearest option is 100.