Use the following information in Questions 10-12. Nationwide, the amount charged

Question

Use the following information in Questions 10-12. Nationwide, the amount charged by doctors for performing a particular minor surgical procedure averages S1220 and varies with a standard deviation of $300. We randomly select 160 bills from the population of all bills charged for this surgery. Let X represent the average amount charged for 160 surgical procedures. OUESTION 10 The mean a nd standard de are bAs = $ 122 UESTION 11 The probability that the 0 552 QUESTION 12 Compute f that separates the bottom 20% of the sampling distribution from the rest of the sample mean values. a. 1240 b. 1472 c. 968 d. 1200

Explanation / Answer

for bottom 20%,the z value can be found from normal distribution table as -0.84

thus answer is mean+z*s =1220-0.84*300=968 or option C

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