MTH 1013 (4) Save Homework: Homework 2 Sections 2.5-2.7 10 of 15 (15 complete) H

Question

MTH 1013 (4) Save Homework: Homework 2 Sections 2.5-2.7 10 of 15 (15 complete) Hw Score: 90.93%, 13.64 of 15 pts Score: 0.5 of 1 pt Question Help & 2.6.99 of dental practitioners, the study reported that the A study published in a journal investigated allergic reactions of dental patients to local anesthetics. Based on a survey used per week by dentists was 81, with a standard deviation of 23. Suppose we want to determine the mean number of units (ampoules) of local anesthetics percentage of dentists who use less than 127 units of local anesthetics per week. Complete parts a and b a. Assuming Select the correct choice below and fill in any answer boxes in your choice. less than 127 units of local anesthetics per week? mac no shape et the ditrbulion rcentage of centats use B. Unknown distribution, what percentage of dentists use less than 127 units of local anesthetics per week? Select the correct choice below and fill in any answer boxes in your choice. O B. Unknown

Explanation / Answer

b)

for normal distribution z=(X-mean)/std deviation

hence P(X<127)=P(Z<(127-81)/23)=P(Z<2)=97.72%

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