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- From Mathematics, Statistics
- Due on 10 Oct, 2020 12:46:00
- Asked On 09 Oct, 2020 12:53:12
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- Mycourse1969
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1) the lenght of life of the whirlpool washer s approximately normally distributed wiht the mean of 3.1 years and standard deviation of 1.2 years . If this thyp of washer is guaranteed for one year , what fraction of original sales will require replacement?

2) the time it takes to come to school is approximately normally distributed with a mena of 45 minutes and standard deviation of 3 minutes . what time must yo leave home in the moring so that you are 95% sure of arriving by 9 am

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- Submitted On 09 Oct, 2020 08:16:33

Answer posted by

- Tutorkagunya
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(1)
Step 1: Calculate the Z score
Z= (x - µ)/σ
x is the guaranteed period in years= 1
µ is the mean in years= 3.1
σ is the standard deviation in years= 1.2
Z= (1 – 3.1)/1.2
Z= –2.1/1.2
Z= -1.75
Step 2: Find the area from the z-table that corresponds to the Z score -1.75
The area or P(Z≤1)= 0.0401 (-1...

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