Question 472891: This question has five answer choices. Select the best one of
the answer choices given.
16. The figure shows a normal distribution with mean m and
standard deviation d, including approximate percents of
the distribution in each of the six regions shown.
For a population of 800,000 subway riders, the numbers of
subway trips taken per rider last January are approximately
normally distributed with a mean of 56 trips and a standard
deviation of 13 trips. Approximately how many of the riders
took between 30 and 43 trips last January?
A 60,000
B 110,000
C 160,000
D 210,000
E 270,000
Drawing a picture of the the distribution table will solve this.
Answer by edjones(8007)   (Show Source):
You can put this solution on YOUR website!  , 
z=(30-56)/13=-26/13=-2
z=(43-56)/13=-13/13=-1
Area under the normal curve between z=-2 and z=-1 is 0.136
800,000 * 0.136 = 108,800 B
.
Ed
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