Question 1194255: According to the Internal revenue service, the mean tax refund for the year 2019 was $2,708. Assume the standard deviation is $650 and the amounts refunded follow a normal probability distribution.
1. What percent of the refunds are more than $3,000?
2. What percent of the refunds are more than $3,000 but less than $3,500?
3. What percent of the refunds are more than $2,500 but less than $3,500?
Answer by ikleyn(52799)   (Show Source):
You can put this solution on YOUR website! .
It is about finding the area under the normal curve.
Use free of charge online calculator
https://onlinestatbook.com/2/calculators/normal_dist.html
specially intended for this purpose.
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