Answer:
(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.
= [tex]P(X>95)\\\\= P(z>0.75)\\\\==0.2266[/tex]
b) the proportion of costs that will be less than $60
=[tex]P(X<60)\\= 0.1587[/tex]
c) 90% of normal costs would be between
-1.645 <Z<1.645
Corresponding x scores are
[tex]80[/tex]±32.9
=(47.1, 112.9)
