Answer:
It would take 4 men 37 hrs and 12 mins to complete the same task.
step-by-step explanation:
Let X be the time the four men would use to complete the task.
From the question, 6 men completed a task in 24 hrs and 48 mins
But
Using ratio and proportion
if more, less divides and if less, more divides.
4 men required more time to complete the task
Hence:
x = 37 hrs 12 mins
Given the scores on a statewide standardized test are normally distributed
Mean = μ = 78
Standard deviation = σ = 3
Normalize the data using the z-score by using the following formula and chart:
Estimate the percentage of scores of the following cases:
(a) between 75 and 81
so, the z-score for the given numbers will be:
As shown, the percentage when (-1 < z < 1) = 68%
(b) above 87
The percentage when (z > 3) = 0.5%
(c) below 72
The percentage when (z < -2) = 0.5 + 2 = 2.5%
(d) between 75 and 84
The percentage when ( -1 < z < 2 ) = 68 + 13.5 = 81.5%
