math math math i need help! PLZ

Mathematics
Tutor: None Selected Time limit: 1 Day

In a recent study of animal sleep times at the zoo, the mean amount of sleep per night is 6.3 hours with a standard deviation of 2.1. If 23 animals are selected, find the probability that the mean sleep time per night is greater than 8 hours.

May 23rd, 2015


z= (8-6.3)/ 2.1

z= 0.8

probability that the mean sleep time per night is greater than 8 hours is 0.8

May 23rd, 2015

A0.2981
B0.3207
C0.0103
D0.0001
the choices I was given.

May 23rd, 2015

then its surely B)...................................

May 23rd, 2015

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