Q.2 a) A certain type of storage battery lasts on average, 3.0 years, with a standard

deviation of 5 years. Assuming that battery life is normally distributed, find the

probability that a given battery will last less than 2.3 years.

b) There are 272 employees in an organization. 180 employees are graduates and

95 are females and 145 graduates are male. What is the probability that randomly

selected employee is

i. Graduate and female.

ii. Male and not graduate.

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