
7.5 Team Challenge (C)
Quiz
•
Mathematics
•
11th - 12th Grade
•
Medium
Kevin Koch
Used 2+ times
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4 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a study done on the life expectancy of 500 people in a certain geographic region, the mean age at death was 72 years and the standard deviation was 5.3 years. If a sample of 50 people from this region is selected, find the probability that the mean life expectancy will be less 70 years.
0.8303
-2.67
0.8300
0.0038
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The scores of students on the ACT college entrance exam in a recent year were normally distributed with a mean of 18.6 and a standard deviation of 5.9. If a random sample of 100 students is taken, what is the probability that the mean of the sample is greater than 20?
0.9911
0.0089
0.8901
2.37
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
The weights of adult males are normally distributed with a mean of 172 pounds and a standard deviation of 29 pounds. What is the probability that 25 randomly selected adult males will have a mean weight between 180 and 190 pounds?
0.9162
0.0828
0.9990
1.38
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Engineers must consider the breadths of male heads when designing motorcycle helmets. Men have head breadths that are normally distributed with a mean of 6.0 inches and a standard deviation of 1.0 inch. If one male is randomly selected, find the probability that his head breadth is more than 6.2 inches.
0.5793
0.2000
0.4720
0.4207
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