A study investigated allergic reactions of dental patients to local

  

A study investigated allergic reactions of dental patients to local anesthetics. Based on a survey of dental practitioners, the study reported that the mean number of units (ampoules) of local anesthetics used per week by dentists was 79, with a standard deviation od 23. Suppose we want to determine the percentage of dentists who use less than 102 units of local anesthetics per week.
 

a. Assuming that nothing is known about the shape of the distribution for the data, what % of dentists use less than 102 units of local anesthetics per week.
 

b. Assuming that the data has a mound-shaped distribution, what % of dentists use less than 102 units of local anesthetics per week

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