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Chapter 6 Test-Fedor

Last updated almost 5 years ago

8 questions

3

Question 1

1.

A light bulb is advertised as lasting an average of 1000 hours with a standard deviation of 150 hours. Find the probability of buying a light bulb that will last between 1000 and 1250 hours?

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3

5

Question 4

4.

A college gives an entrance exam which results in a mean score of 247 with a standard deviation of 28. If only the upper 25 percent of the applicants are to be admitted, what should the cutoff score be?

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5

Question 7

7.

The average age of a NBHS senior is 19.4 years. If the distribution of ages is normal and 10% of the seniors are older than 20.6 years, then find the standard deviation. Round your answer to a whole number.

5

Question 2

2.

A light bulb is advertised as lasting an average of 1000 hours with a standard deviation of 150 hours. Find the probability of buying a light bulb that will last more than 1250 hours?

Question 3

3.

A light bulb is advertised as lasting an average of 1000 hours with a standard deviation of 150 hours. Find the probability of buying a light bulb that will last less than 1250 hours?

Question 5

5.

Mr. Fedor is looking to buy a new house this year. The mean price for homes is $275,000 with a standard deviation of $18,000. If Mr. Fedor is going to look at homes in the middle 80% of this distribution, then what is the minimum price house he would buy and what is the maximum price house he could buy.

Question 6

6.

Mensa is an organization that accepts members who score in the top 2% of the population of standard intelligence tests. If the mean IQ is 100 with a standard deviation of 15, then what should the minimum IQ score be accepted by Mensa?

Question 8

8.

The average height of senior girls at NBHS is 63 inches. The standard deviaiton is 4 inches. If the variable is normally distributed, find the probability that the height of 36 girls would be greater than 64 inches. Use the central limit theorem to solve.