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Can someone help me solve these questions please? Assume the average (mean) number of minutes a group of people meditate is 20 minutes per day

Can someone help me solve these questions please?
Assume the average (mean) number of minutes a group of people meditate is 20 minutes per day and has a standard deviation of 4 minutes. 6. What percent of people will meditate daily for less than 18 minutes? 7. What percent of people will meditate daily for more than 26 minutes? 8. What percent of people will meditate daily in between 14 and 22 minutes? 9. If 300 people are meditating, how many will meditate daily for less than 18 minutes? 10 If 2500 people are meditating, how many will meditate less than 26 minutes

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