For a population of 800000 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? ... ?

Question

Harold Brennan

Mathematics

15 November, 13:37

For a population of 800000 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? ... ?

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Tamia Clements · Answer 1

So, we have

Z = x-μ / σ

Mean would be = 56

30 - 56 = |-26| 4

3 - 56 = |-13|

and

Standard deviation = 13

2 - 1 will give us the approximate area

95/2 - 68/2 = N

95 - 68 = 27

27 / 2 = 13.5

Hence, the answer would be

800,000 *.135

= 108000