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# Songs on the radio have a mean time of 3.5 minutes with a standard deviation of 0.2 minutes. What is the

probability the next song played is shorter than 3.8 minutes?

a）0.0668

b）0.9332

c）0.7486

d）0.2514

Visitors to a museum spend a mean time of 150 minutes with a standard deviation of 35 minutes. What is the probability a visitor chosen at random stays longer than 100 minutes?

a）0.7580

b）0.9236

c）0.0764

d）0.2420

There is a 0.1 probability of snow on a day in November. Could this situation be modelled using the normal distribution?

a）no，because n（1-p）<5

b）yes

d）no，because np<5

Phones have a 0.01 probability of being faulty. In a situation involving 600 phones, what is the mean and standard deviation of the number of faulty phones?

a）mean=594.sd=2.44

b）mean=6.sd=5.94

c）mean=6.sd=2.44

d）mean=594.sd=5.94

Songs on the radio have a mean time of 3.5 minutes with a standard deviation of 0.2 minutes. What is the probability the next... View the full answer

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