Question

Suppose that the mean weight of infants born in a community is μ = 3170 g and σ = 690 g.
Compute the indicated probabilities below.

a) p(x < 2800)
probability =

b) p(x > 4200)
probability =

c) p(2300 < x < 4000)
probability =

d) p(1700 < x < 2800)
probability =

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Suppose that an anxiety measure has a mean of 108 and variance of 289.00. The researcher only wants to work with 43% of the lower participants. What is the largest average score the researcher should consider with a sample size of 33?

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A dentist is interested in obtaining information about delinquent (past due) accounts. Since the practice opened 15 years ago, delinquent accounts are normally distributed with an average of 56 days and a variance of 121.00 days. The dentist randomly selected a sample of 32 delinquent accounts with an average of 47 days.

a) The dentist wants to know what average number of days is less than 49% from the past 15 years.


b) Is the average days from the sample of 32 more than the 49% average from the past 15 years?

Answer 1

pls upload only one question at a time