The empirical rule states that, for data having a bell-shaped ...

[j.rubin]

The empirical rule states that, for data having a bell-shaped distribution, the portion of data values being within one standard deviation of the mean is approximately _____.
 a. 33
  b. 50
  c. 68
  d. 95

Question 2

A bank has kept records of the checking balances of its customers and determined that the average daily balance of its customers is 300 with a standard deviation of 48 . A random sample of 144 checking accounts is selected.
 a. What is the probability that the sample mean will be more than 306.60?
  b. What is the probability that the sample mean will be less than 308?
  c. What is the probability that the sample mean will be between 302 and 308?
  d. What is the probability that the sample mean will be at least 296?

[softEldritch]

Answer to Question 1

c

Answer to Question 2

a. 0.0495
b. 0.9772
c. 0.2857
d. 0.8413

[j.rubin]

TYSM

[hramirez205]

YES! Correct, THANKS for helping me on my review