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Yeetious
21.12.2019 •
Mathematics
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.
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Ответ:
(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.
=![P(X95)\\\\= P(z0.75)\\\\==0.2266](/tpl/images/0428/5930/489cb.png)
b) the proportion of costs that will be less than $60
=![P(X](/tpl/images/0428/5930/51600.png)
c) 90% of normal costs would be between
-1.645 <Z<1.645
Corresponding x scores are
=(47.1, 112.9)
Ответ:
The correct answer is D
Step-by-step explanation: