SOLUTION: In a certain microwave oven on the high power setting, the time it takes a randomly chosen kernel of popcorn to pop is normally distributed with a mean of 140 seconds and a standar

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Question 453425: In a certain microwave oven on the high power setting, the time it takes a randomly chosen kernel of popcorn to pop is normally distributed with a mean of 140 seconds and a standard deviation of 25 seconds.
(1)
What percentage of the kernels will fail to pop if the popcorn is cooked for (Round your answers to 4 decimal places. Omit the "%" sign in your response.)

(a) Two minutes %
(b) Three minutes %
(2)
Determine the time that would be allowed in order to get the following percentage of the kernels popped. (Round your answers to 3 decimal places.)

(c) 95 percent seconds
(d) 99 percent seconds
Answer by edjones(8007) About Me  (Show Source):
You can put this solution on YOUR website!
1a)
120-140=-20
-20/25=-.8
.7881
.
1b)
180-140=40
40/25=1.6
.0548
.
Ed