Name: __________________ Period: _________________

Matching - Vocabulary 1. ____a. Uniform distribution

____b. Normal distribution 3. ____c. Standard normal dist. 2.

4. ____d. Central limit theorem

a. As sample size  , dist. of sample means approaches a normal distribution

b. C.  = 0,  = 1

D.

Draw a graph – don’t forget your x-line, z-score line, and P-line! Round answers to 4 decimal places. 5. In one region, the September energy consumption levels for single-family homes are found to be normally distributed with a mean of 1050 kwh and a standard deviation of 218 kwh. (a) For a randomly selected home, find the probability that the September energy consumption level is between 1050 kwh and 1250 kwh. (b) For a randomly selected home, find the probability that the September energy consumption level is below 1200 kwh (c) For a randomly selected home, find the probability that the September energy consumption level is between 1100 kwh and 1225 kwh (d) For a randomly selected home, find the probability that the September energy consumption level is above 1175 kwh. (e) For a randomly selected home, find the probability that the September energy consumption level is between 1000 kwh and 1200 kwh.

P45 =__________ (f) Find P45 (the 45th percentile). (g) If 50 different homes are randomly selected, find the probability that their mean energy consumption level for September is greater than 1075.

6. In a study of the causes of death, it was found that 52% of all Americans die from heart disease. Find the probability that in a group of 500 randomly selected Americans, at least 275 die from heart disease. 7. The Worthington Pottery Company manufactures beer mugs in batches of 120 and the overall rate of defects is 5%. Find the probability of having more than 6 defects in a batch. 8. A bank’s loan officer rates applicants for credit. The ratings are normally distributed with a mean of 200 and a standard deviation of 50. (a) If an applicant is randomly selected, find the probability of a rating that is between 200 and 275. (b) If an applicant is randomly selected, find the probability of a rating that is below 250. (c) If an applicant is randomly selected, find the probability of a rating above 300. (d) If an applicant is randomly selected, find the probability of a rating between 170 and 220. (e) If an applicant is randomly selected, find the probability of a rating above 178. (f) Find D6 (g) If 40 different applicants are randomly selected, find the probability that their mean is above 215. 9. Replacement times for CD players are normally distributed with a mean of 7.1 years and a standard deviation of 1.4 years. Find the replacement time separating the top 45% from the bottom 55%.

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The Worthington Pottery Company manufactures beer mugs in batches of 120. and the overall rate of defects is 5%. Find the probability of having more than 6. defects in a batch. 8. A bank's loan officer rates applicants for credit. The ratings are normally. distributed with a mean of 200 and a standard deviation of 50. (a) If an ...

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