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Mathematics, 21.12.2020 14:00 katiebonar13

PLEASE HELP ME TIME SENSITIVE The mean life of a television set is 123 months with a standard deviation of 19 months. If a sample of 55 televisions is randomly selected, what is the probability that the sample mean would differ from the true mean by greater than 1.2 months?

I just need help getting from 1 - P (-0.47 < z < 0.47) to the answer. In my lesson it says the next step is 0.3192 but I have NO CLUE where that number comes from.

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PLEASE HELP ME TIME SENSITIVE The mean life of a television set is 123 months with a standard devia...
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