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Unformatted text preview: Classwork 4 (Chapter 5)
Name MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Select the appropriate distribution.
1) Select the distribution that appears to be closest to normal. D) None of the distributions appear to be normal or near—normal. Use the following distribution to answer the question. Hours of 'life' of light bulbs : ............................................................................................................................................... q, 0 1000 2000 3000 5000 hours 4000 2) What is the total area under the curve? A) 3 B) 2500 C) 1 D) 3000 1) 2) 3) What is the mean of the distribution? 3)
A) 2000 B) 2500 C) 4000 D) 3000 SHORT ANSWER. Write the word or phrase that best completes each statement or answers the question. Apply the 6895—99.7 rule to answer the question.
4) The lifetimes of light bulbs of a particular type are normally distributed with a mean of 290 4)
hours and a standard deviation of 5 hours. What percentage of the bulbs have lifetimes
that lie within 1 standard deviation to either side of the mean? 5) The lifetimes of light bulbs of a particular type are normally distributed with a mean of 400 5)
hours and a standard deviation of 6 hours. What percentage of the bulbs have lifetimes
that lie within 2 standard deviations to either side of the mean? Find the indicated percentage for the normally distributed variable. Round your answer to two decimal places, if
necessary.
6) The diameters of bolts produced by a certain machine are normally distributed with a 6)
mean of 0.30 inches and a standard deviation of 0.01 inches. What percentage of bolts will have a diameter greater than
0.31 inches? 7) The volumes of soda in quart soda bottles are normally distributed with a mean of 32 7)
ounces and a standard deviation of 1.2 ounces. What percentage of soda bottles will have a
volume less than
31.58 ounces? 8) A bank's loan officer rates applicants for credit. The ratings are normally distributed with a 8)
mean of 200 and a standard deviation of 50. What percentage of the ratings will be between 180 and 210? Find the requested percentile.
9) At one college, GPA's are normally distributed with a mean of 2.9 and a standard deviation 9)
of 0.6. Find the 75th percentile. Round your answer to one decimal place. MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question. Find the requested mean or standard deviation.
10) The heights of a large population of students have a mean of 60" with a standard deviation of 3". 10)
What is the mean of the resulting distribution of sample means for n =16?
A) 30" B) 15" C) 60" D) 45" 11) The heights of a large population of students have a mean of 62" with a standard deviation of 2". 11)
What is the standard deviation of the resulting distribution of sample means for n =16 ?
A) 0.5" B) 62" C) 2" D) 16" ...
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This note was uploaded on 03/18/2012 for the course STA 1013 taught by Professor Moody during the Spring '08 term at FSU.
 Spring '08
 MOODY
 Statistics

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