What is the probability that 15 or more-were male

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According to the latest survey of Australian Bureau of Statistics, 50% of people in Sydney are male. A random sample of 20 people in Sydney was taken,

i) What is the probability that 15 or more-were male?

ii) What is the probability that less than 10 were male?

b) The active lifetime of laptop computers is normally distributed with a population mean of 36 months and a standard deviation of 6 months.

i) What is the probability that a randomly selected laptop will last more than 40 months?

ii) If 4 laptops selected at random, find the probability of the average active lifetime of these laptops will be less than 42 months?

Reference no: EM132855142

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