Question: (CO 3) The speed of cars on a stretch of road is normally distributed with an average 48 miles per hour with a standard deviation of 5.9 miles per hour. What is the probability that a random ly selected car is violating the speed limit of 50 miles per hour? Question: (CO 3) A survey indic...
question co 3 the weights of ice cream cartons are normally distributed with a mean weight of 20 ounces and a standard deviation of 03 ounces you rando
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MATH 221
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Math 221 Week 4 Quiz
Question 1
pts
(CO 3) The speed of cars on a stretch of road is normally distributed with an average 40
miles per hour with a standard deviation of 5.9 miles per hour. What is the probability
that a randomly selected car is violating the speed limit of 50 miles per hour?
0.10
You Answered
0.95
0.59
Correct Answer
0.05
text pages 246-248
Question 2
pts
(CO 3) A survey indicates that shoppers spend an average of 26 minutes with a
standard deviation of 16 minutes in your store and that these times are normally
distributed. Find the probability that a randomly selected shopper will spend less than
20 minutes in the store.
0.50
Correct Answer
0.35
You Answered
0.65
, 0.62
text pages 246-248
Question 3
pts
(CO 3) The monthly utility bills in a city are normally distributed with a mean of $128 and
a standard deviation of $23. Find the probability that a randomly selected utility bill is
between $110 and $130.
0.316
0.783
Correct!
0.318
0.217
text pages 246-248
Question 4
pts
(CO 3) A restaurant serves hot chocolate that has a mean temperature of 175 degrees
with a standard deviation of 8.1 degrees. Find the probability that a randomly selected
cup of hot chocolate would have a temperature of less than 164 degrees. Would this
outcome warrant a replacement cup (meaning that it would be unusual)?
You Answered
Probability of 0.09 and would warrant a refund
Probability of 0.91 and would not warrant a refund
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