Math homework please help me

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Suppose the number of students in a class for the Business Statistics program at a University has a mean of 23 with a standard deviation of 4.3. If 15 classes are selected randomly, find the probability that the mean number of students is between 20 and 30. 

May 23rd, 2015


20/23*4.3*15/30=12/15

12/15.......................................answer

May 23rd, 2015

 
0.9966
0.9699
0.6824
0.8412
my choices I was given .

May 23rd, 2015

0.9699.............................................................................................................please best me in the comments. Thanks so much

May 23rd, 2015

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