Question
In: Statistics and Probability
A) A company that owns a large number of grocery stores claims that customers who pay...
A) A company that owns a large number of grocery stores claims that customers who pay by personal check spend an average of $87 with a standard deviation of $22. Assume the amount spent by these customers is normally distributed.
What is the probability that a customer using a check spends less than $90?
Express your answer as a decimal rounded to four places after the decimal point.
B)
A company that owns a large number of grocery stores claims that customers who pay by personal check spend an average of $87 with a standard deviation of $22. Assume the amount spent by these customers is normally distributed.
What is the probability that a customer using a check spends between $80 and $85?
Express your answer as a decimal rounded to four places after the decimal point.
C)
A company that owns a large number of grocery stores claims that customers who pay by personal check spend an average of $87 with a standard deviation of $22. Assume the amount spent by these customers is normally distributed.
The top 10% of customers using a check pay _____________ or more for groceries.
Round your answer to 2 decimal places.
D)
A company that owns a large number of grocery stores claims that customers who pay by personal check spend an average of $87 with a standard deviation of $22. Assume the amount spent by these customers is normally distributed.
The most frugal 20% of customers pay ___________ or less for groceries.
Round your answer to the nearest hundredth.
Solutions
orchestra answered 2 years agoRelated Solutions
Suppose data were collected on the number of customers that frequented a grocery stores on randomly...
Suppose data were collected on the number of customers that
frequented a grocery stores on randomly selected days before and
after the governor of the state declared a lock down due to COVID
19. A sample of 6 days before the lockdown were chosen as well as 6
days randomly chosen after the lock down was in place. The number
of shoppers each day were as follows:
Before lock down
After lock down
100
60
110
50
115
70
120...
Suppose data were collected on the number of customers that frequented a grocery stores on randomly...
Suppose data were collected on the number of customers that
frequented a grocery stores on randomly selected days before and
after the governor of the state declared a lock down due to COVID
19. A sample of 6 days before the lockdown were chosen as well as 6
days randomly chosen after the lock down was in place. The number
of shoppers each day were as follows:
Before lock down
After lock down
100
60
110
50
115
70
120...
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Conduct an appropriate statistical test at the 5% significance
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