Question: According to the data collected by CU mobile, monthly data usage of each of their customers follows a normal distribution with a mean of 1.8

According to the data collected by CU mobile, monthly data usage of each of their customers follows a normal distribution with a mean of 1.8 GB and a standard deviation of 0.81 GB. If we select 4 customers, what is the probability that all of them uses more than 2.4 GB per month?

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