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The probability that a flashlight battery will last more than 28 hours is 0.80. The length of life of any one battery is independent of

The probability

that a flashlight battery will last more than 28 hours is 0.80. The length of

life of any one battery is independent of that of any other. A total of 5 batteries are tested. (Hint: Use

the binomial probability distribution).

a)What is the probability that all five batteries will last for more than 28 hours?

[2 marks]

b) What is the probability that at least one battery will last for more than 28 hours?

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