10•10•10=1,000=10^3
1,608 divided by 1,000 equals 1.608
The probability that the sample mean is less than 30 school days will be given as follows:
the z-score is given by:
z=(x-μ)/σ
where
μ- stand deviation
σ-mean
thus the z-score of our information is:
z=(30-28)/9
z=0.222222
hence the probability that the sample mean is less than 30 will be:
P(x<30)=0.5871~58.71%
If you have any more questions let me know!
<span>x=8+1/3.33333333333
hope this helped</span>
