statistics
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1. Award: 16.66 points
2. Award: 16.66 points
Answer the following:
a. Find the uniform continuous probability for P(X < 13) for U(0, 50). (Round your answer to 2 decimal places.)
Probability
b. Find the uniform continuous probability for P(X > 739) for U(0, 1,000). (Round your answer to 3 decimal places.)
Probability
c. Find the uniform continuous probability for P(23 < X < 53) for U(13, 66). (Round your answer to 4 decimal places.)
Probability
References
Worksheet Difficulty: 1 Easy Learning Objective: 0702 Calculate uniform probabilities.
Assume the weight of a randomly chosen American passenger car is a uniformly distributed random variable ranging from 1,577 pounds to 4,283 pounds.
(a) What is the mean weight of a randomly chosen vehicle? (Round your answer to the nearest whole number.)
Mean weight
(b) What is the standard deviation of a randomly chosen vehicle? (Round your answer to 4 decimal places.)
Standard deviation
(c) What is the probability that a vehicle will weigh less than 2,266 pounds? (Round your answer to 4 decimal places.)
Less than 2,266 pounds
(d) What is the probability that a vehicle will weigh more than 3,528 pounds? (Round your answer to 4 decimal places.)
More than 3,528 pounds
(e) What is the probability that a vehicle will weigh between 2,266 and 3,528 pounds? (Round your answer to 4 decimal places.)
Between 2,266 and 3,528 pounds
References
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3. Award: 16.66 points
4. Award: 16.66 points
5. Award: 16.66 points
Worksheet Difficulty: 2 Medium Learning Objective: 0702 Calculate uniform probabilities.
The weight of a small Starbucks coffee is a normally distributed random variable with a mean of 395 grams
and a standard deviation of 22 grams. Find the weight that corresponds to each event. (Use Excel or Appendix C to calculate the zvalue. Round your final answers to 2 decimal places.)
a. Highest 30 percent
b. Middle 70 percent to
c. Highest 90 percent
d.
Lowest 20 percent
References
Worksheet Difficulty: 2 Medium Learning Objective: 0705 Solve for z or x for a given normal probability using tables or Excel.
The credit scores of 35yearolds applying for a mortgage at Ulysses Mortgage Associates are normally
distributed with a mean of 500 and a standard deviation of 120.
(a) Find the credit score that defines the upper 20 percent. (Use Excel or Appendix C to calculate the z value. Round your final answer to 2 decimal places.)
Credit score
(b) Eightyfive percent of the customers will have a credit score higher than what value? (Use Excel or Appendix C for calculation of zvalue. Round your final answer to 2 decimal places.)
Credit score
(c) Within what range would the middle 90 percent of credit scores lie? (Use Excel or Appendix C for calculation of zvalue. Round your final answer to 2 decimal places.)
Range to
References
Worksheet Difficulty: 2 Medium Learning Objective: 0705 Solve for z or x for a given normal probability using tables or Excel.
The fracture strength of a certain type of manufactured glass is normally distributed with a mean of 506
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6. Award: 16.70 points
MPa with a standard deviation of 12 MPa.
(a) What is the probability that a randomly chosen sample of glass will break at less than 506 MPa? (Round your answer to 2 decimal places.)
Probability
(b) What is the probability that a randomly chosen sample of glass will break at more than 531 MPa? (Round your answer to 4 decimal places.)
Probability
(c) What is the probability that a randomly chosen sample of glass will break at less than 544 MPa? (Round your answer to 4 decimal places.)
Probability
References
Worksheet Difficulty: 2 Medium Learning Objective: 0704 Find the normal probability for a given z or x using tables or
Excel.
If the weight (in grams) of cereal in a box of Lucky Charms is N(488,4), what is the probability that the box will contain less than the advertised weight of 475g? Note: You may need to use Excel to calculate the exact probabilities. (Round your answer to 5 decimal places.)
Probability
References
Worksheet Difficulty: 1 Easy Learning Objective: 0704 Find the normal probability for a given z or x using tables or
Excel.