Students of a large university spend an average of 5 a day on ...

[danielfitts88]

Students of a large university spend an average of 5 a day on lunch. The standard deviation of the expenditure is 3 . A simple random sample of 36 students is taken.
 a. What are the expected value, standard deviation, and shape of the sampling distribution of the sample mean?
 b. What is the probability that the sample mean will be at least 4?
  c. What is the probability that the sample mean will be at least 5.90?

Question 2

For the standard normal probability distribution, the area to the left of the mean is _____.
 a. .5
  b. 0.5
  c. any value between 0 and 1
  d. 1

[brittrenee]

Answer to Question 1

a. 5.0; .5; normal
b. .9772
c. .0359

Answer to Question 2

b

[danielfitts88]

Gracias!

[coreycathey]

Thanks for the timely response, appreciate it