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vesna_86 [32]
3 years ago
5

Statistics from Cornell's Northeast Regional Climate Center indicate that Ithaca, NY, gets an average of 35.4 inches of rain eac

h year, with a standard deviation of 4.2 inches.
During what percentage of years does Ithaca get more than 30 inches of rain?
a. approximately 10.03%
b. approximately 10.95%
c. approximately 90.07%
d. approximately 5.82
e. approximately 94.18%
Mathematics
1 answer:
alisha [4.7K]3 years ago
3 0

Answer:

c. approximately 90.07%

Step-by-step explanation:

We need to calculate z-statistic of 30 inches of rain in the normal distribution with an average of 35.4 inches of rain each year, and a standard deviation of 4.2 inches.

z score can be calculated using the formula

z=\frac{X-M}{s} where

  • X =30 inches of rain
  • M is the average rain in inches (35.4)
  • s is the standard deviation (4.2)

using the numbers we get z=\frac{30-35.4}{4.2} ≈ −1,286

Then percentage of years does Ithaca get more than 30 inches of rain is

P(z>-1.286) =1- P(z<-1.286)=1-0.0993 ≈0.9007 or 90.7%

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