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Answer:see how long they have to measure it
Explanation:
Answer: 3.22
Explanation:
Given that;
mean = 2.5 min
standard deviation = 0.25 min
now to get the value of X required, we say
z = (x - u) / a
where z is the distance from the mean measured in the standard deviation units, x is the value we are interested in, u is the mean distribution, a is the standard deviation of the distribution.
the time delay should be just enough to allow 99.8% of the cabinets to dry completely = 99.8/100 = 0.9980
first we determine an appropriate z value.
Using the standardized normal tables,
value of z for approximately 0.9980 is 2.88
so using our initial equation z = (x - u) / a
we substitute the value
z = (x - u) / a
2.88 = ( x - 2.5) / 0.25
2.88 * 0.25 = x - 2.5
0.72 = x - 2.5
x = 0.72 + 2.5
x = 3.22
