In: Statistics and Probability
Cans of regular Coke are labeled as containing 12 oz. Statistics students weighed the contents of 7 randomly chosen cans, and found the mean weight to be 12.12 ounces. Assume that cans of Coke are filled so that the actual amounts are normally distributed with a mean of 12.00 oz and a standard deviation of 0.09 oz. Find the probability that a sample of 7 cans will have a mean amount of at least 12.12 oz.
Solution :
Given that,
mean =
= 12
standard deviation =
= 0.09
=
=12
=
/
n = 0.09 /
7 = 0.034
P( >12.12 ) = 1 - P(
<12.12 )
= 1 - P[(
-
) /
< (12.12-12) / 0.034]
= 1 - P(z <3.53 )
Using z table
= 1 - 0.9998
= 0.0002
probability=0.0002