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Isabel bought some books for $6 each and received a discount of $8 off of her total purchase. She spent $58 after the discount.
1 answer:
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Answer:
Step-by-step explanation:
Given that the random variable X is normally distributed, with
mean = 50 and standard deviation = 7.
Then we have z=
Using this and normal table we find that
a)
b) When z=0.02
we get
c) 90th percentile z value =1.645
90th percentile of X
