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Question

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

c)not enough information to answer

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

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