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johnisawesome999
17.10.2021 •
Mathematics
Mrs smith reading class can read an average of 170 words per minutes with a standard deviation of 20 words per minute. The top 5% of her class will receive an award. What is the minimum number of words per minute a student needs to read to get an award?
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Ответ:
Bradley practice 109500 more minutes than Jonas over the course of 2 years.
Step-by-step explanation:
Jonas practices guitar 1 hour a day for 2 years.
1 year = 365 days
2 years =![365 \times 2 = 730 days](/tpl/images/0648/7234/64d67.png)
1 hour = 60 minutes
So, Jonas practice for 60 minutes in 1 day
Jonas practice for minutes in 365 days =![365 \times 60 =21900 minutes](/tpl/images/0648/7234/cb840.png)
Bradley practices the guitar 2 hours a day more than Jonas.
So, Bradley practice the guitar for hours per day = 2+1=3 hours
3 hours = 3 \times 60 = 180 minutes
Bardley practice for minutes per day = 180 minutes
Bardley practice for minutes for 730 days =![180 \times 730 =131400 minutes](/tpl/images/0648/7234/730ef.png)
Difference in minutes in 2 years = 131400-21900=109500 minutes
Hence Bradley practice 109500 more minutes than Jonas over the course of 2 years.