Determine if each claim would best be tested with a hypothesis test on a mean or

Question

Determine if each claim would best be tested with a hypothesis test on a mean or a hypothesis test on a proportion. If the data is suitable for a hypothesis test on a mean, type "M", otherwise type "P" for a hypothesis test on a proportion.  

a)   More than 75% of all students taking the SAT spent more than 100 dollars on preparation study materials.
answer:  
b)   The average number of words in a text message between teenagers is less than 10.
answer:  
c)   The mean time a person is on hold when calling the department of motor vehicles in Washburn County is less than 10 minutes.
answer:  
d)   On average, fewer than 3 out of every 10 computers purchased last year were desk tops.  
answer:  
e)   A majority of people believe there are no good candidates running for mayor in the upcoming election
answer:

Explanation / Answer

a)   More than 75% of all students taking the SAT spent more than 100 dollars on preparation study materials.
answer: P
b)   The average number of words in a text message between teenagers is less than 10.
answer: M
c)   The mean time a person is on hold when calling the department of motor vehicles in Washburn County is less than 10 minutes.
answer: M
d)   On average, fewer than 3 out of every 10 computers purchased last year were desk tops.  
answer: M
e)   A majority of people believe there are no good candidates running for mayor in the upcoming election
answer: P

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