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battery life of a new phone , trac, follows auniform distribution with a mean of 18 hours. This implies that the variance of battery life

battery life of a new phone , trac, follows auniform distribution with a mean of 18 hours. This implies that the variance of battery life is 324 hours.

Based on a random sample of 49 randomly chosen trac cell phones, what is the approximate probability that that sample mean is less than 19 hours?

answer- 0.651 please explain

sq rt of 324/ sq rt of 49?

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