1. The mean amount of gasoline and services charged by Key Refining Company credit customers is $70 per month. The distribution of amounts spent is approximately normal with a standard deviation of $10. What is the probability of selecting a credit card customer at random and finding the customer charged between $70 and $83?
A) 0.1962
B) 0.4032
C) 0.3413
D) 0.4750

2. The upper and lower limits of a uniform probability distribution are:
positive and negative infinity.
plus and minus three standard deviations.
0 and 1.
the maximum and minimum values of the random variable.

11. The employees of Cartwright Manufacturing are awarded efficiency ratings. The distribution of the ratings approximates a normal distribution. The mean is 400, the standard deviation 50. What is the area under the normal curve between 400 and 482?
A) 0.5000
B) 0.4495
C) 0.3413
D) 0.4750

Solution Summary

This solution is comprised of a detailed explanation of standard normal distribution or z score. In this solution, step-by-step explanation of this complicated topic provides students with a clear perspective of standard normal distribution to find the probability.

... week we learned about normal distributions: a. Using ... between a normal distribution and a standard normal distribution. ... values to z scores to find probability? ...

Probability distributions - normal distribution. 1. What percentage of the area under the normal curve lies. ... c. More than three standard deviations above the mean ...

... If we want to find the probability of an error of 0.75 V, namely, P (−0.7 ... σ ~ N (0,1) (3) You can look up a table for the standard normal distribution N(0,1 ...

... steps on calculating various probabilities and confidence ...Normal Probability Distribution. ... Use the standard normal distribution to calculate the following: 1 ...

... of 225 is selected, what is the standard error of ... problem and several problems finding probabilities and percentiles from normal probability distributions. ...

Probabilities: Mean, Normal Distribution and Standard Deviation. ... 76 mm Hg and standard deviation ... a) What is the probability that a randomly selected woman has a ...

Probability Problems: Standard Normal (Z) Distribution. ... by step method for computing probabilities based on Z ... using a chart on standard normal (z) distribution...

... b) Find the probability that this shipment is not accepted ... with a mean of 80.0 and a standard deviation of ... Find the following probabilities: a) P(x < 74.0) b) P ...