If 85 American teenage girls are randomly selected, what is the probability that their mean expenses on shopping per month is less than 30$? 2. If 60 American teenage girls are randomly selected, what is the probability that their mean expenses on shopping is greater than $32.5? 3. If 90 American teenage girls are randomly selected, what is the probability that their mean expenses is between $30.5 and $32?
(Sampling Distribution of Large & Small Sample Size)
solve..
I. American teenage girls are reported to spend an average of $31 on shopping per
month with standard deviation of $8. If these expenses are
answer the following.
1. If 85 American teenage girls are randomly selected, what is the
their
2. If 60 American teenage girls are randomly selected, what is the probability that
their mean expenses on shopping is greater than $32.5?
3. If 90 American teenage girls are randomly selected, what is the probability that
their mean expenses is between $30.5 and $32?
4. If five of these teenage girls are asked on their expenses on shopping per month,
what is the probability that their mean is between $28.7 and $35.8?
5. The probability that the mean expenses of 40 randomly selected American
teenage girls will be greater than this value of mean is 4%. What is the value of
this unknown mean?
thank you
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