if the mean is 70 minutes, then 90 minutes is 2 standard deviations above 70. if you look at the bell curve i drew, the percent of exams that took over 90 minutes is 2.5%
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The solution is false!
3.1 would become a fraction that will be calculated back into a decimal by the 4th power making it 92.3521=3,600.. so the equality is false because the left hand and the right hand side are different.
You would find the radius by halving the diameter. Then you use the equation
and you get about 28.2 meters.
Answer: x = 13/3 or x = 4.33333....
Solution: ⅜x -1 +1 = ⅝ + 1
Simplify: ⅜x = 13/8
Multiply both sides by eight: 8 x ⅜x = 133 x 8 divided by 8
Simplify: 3x = 13
Divide both sides by three: 3x/3 = 13/3
Simplify: x = 13/3
the estamated answer is 775
