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2 answers:
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Answer:
The highest possible price of a sweater is $28.33
Step-by-step explanation:
We already know that price of jeans is $35.Let's say Mrs.Smith buys 3 sweaters for
dollars each, and since her budget is $120 we have the inequality:
Therefore
Thus the maximum price of a sweater is $28.33
<h2>Answer with explanation:</h2>
Let be the population mean lifetime of circulated $1 bills.
By considering the given information , we have :-
Since the alternative hypotheses is two tailed so the test is a two tailed test.
We assume that the lifetime of circulated $1 bills is normally distributed.
Given : Sample size : n=50 , which is greater than 30 .
It means the sample is large so we use z-test.
Sample mean :
Standard deviation :
Test statistic for population mean :-
The p-value=
Since the p-value (0.0433834) is greater than the significance level (0.02) , so we do not reject the null hypothesis.
Hence, we conclude that we do not have enough evidence to support the alternative hypothesis that the average lifetime of a circulated $1 bill differs from 18 months.