Veterinary costs for standard veterinary services at a local animal hospital follow a normal distribution with a mean of $80 and a standard deviation of $20. (a) find the proportion of costs that will be greater than $95. (b) find the proportion of costs that will be less than $60. (c) find the range of costs that would represent the middle 90% of costs.

(47.1, 112.9)

Step-by-step explanation:

Let X be the veterinary costs for standard veterinary services at a local animal hospital

X is N(80, 20)

a) the proportion of costs that will be greater than $95.

=

b)  the proportion of costs that will be less than $60

=

c) 90% of normal costs would be between

-1.645 <Z<1.645

Corresponding x scores are

±32.9

=(47.1, 112.9)

c

step-by-step explanation:

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