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Assuming a normal distribution, families spends an average of $500 on their monthly cell phone bills with a standard deviation of $75. What is the
Assuming a normal distribution, families spends an average of $500 on their monthly cell phone bills with a standard deviation of $75. What is the probability a random families' bill is between $333 and $550?
D. 73.57% |
A. 32.85% |
C. 15.87% |
B. 6.9% |
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