Question 726730
Notes:


1) The probability of any event is ALWAYS POSITIVE (unless the probability is 0) and it is ALWAYS LESS THAN 1. So if p is the probability of some event, then {{{0<= p <= 1}}} (where p is a real number between 0 and 1)



2) You can't have two values for the probability in part c). Only one probability is possible.


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Use either a calculator or a table to get the following answers



a) 0.754116149619739


b)  0.809213047147489


c)  0.283778446023862


Make sure you round to the proper decimal place as instructed.


Note: if you need me to show you how to use a calculator to get that, let me know. Thanks.


If you don't have a calculator and you don't want to use a table, then wolfram alpha is your next best bet. Just go to that site, type in "normalcdf" without quotes, and you'll be able to compute the probabilities.