Answer:
Step-by-step explanation:
siny=4/20
y=arcsin(4/20)
y=11.54
<span>The mean for both processes is 28+17 = 45 minutes.
The variance is additive, so the total variance is 5+4 = 9. The standard deviation is the square root of variance, which is 3 minutes.
Then the z-score associated with a time of x = 50 minutes is:
z = (x - mean)/SD = (50 - 45)/3 = 1.67
From a z-table, the probability that (z > 1.67) is 0.0475.
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32 is 32.4543611% 0f 98.6
It is 10x the value of the one in the thousands place
