Monthly spending for paging and messaging services. The average individual monthly spending in the U
Question: Monthly spending for paging and messaging services. The average individual monthly spending in the United States for paging and messaging services is $10.15. If the standard deviation is $2.45 and the amounts are normally distributed, what is the probability that a randomly selected user of these services pays more than $15.00 per month? Between $12.00 and $14.00 per month?
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