This is the Big One

[nenaquetuhace]

The average cholesterol content of a certain brand of eggs is 215 mg and the standard deviation is 15 mg. Assume the variable is normally distributed. If a sample of 25 eggs is selected, find the probability that the average cholesterol content of the sample will be larger than 220 mg...

Can someone help me start out this problem and I will try to finish.. thanks.

 

[tkhunny]

Here's a good start...

\(\displaystyle \frac{220-215}{\frac{15}{\sqrt{25}}}\)

 

[nenaquetuhace]

so would that mean

sqr of 25 is 5 then you divide 5 by 15 and you get 33.3 %

 

[tkhunny]

Unfortunately, you seem to have demonstrated only that you need to go have a very serious chat with your academic advisor. What have you been doing all semester? Maybe I just don't know the schedule and this is from your first class rather than for the final exam. Really, go talk it out. I am not encouraged at this point.