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

Question

Use the following information in Questions 10-12. Nationwidc, the amount charged by doctors for performing a particular minor surgical procedure averages $1220 and varies with a standard deviation of S300. 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 proccdures. QUESTION 10 The mean and standard deviation of the average X are a·Ax = SI 220 and Ox-$300. b·Ax = S 1220 and ,-$23.72. c. -57.63 and Tz-S300. d, - $7.63 and = $23.72. QUESTION 11 T es is a. 0.046. b. 0.448 c. 0.552 d. 0.954. QUESTIO re ute that sen noution from the b. 1472 c. 968 d. 1200

Explanation / Answer

solution:- option b. x = $1220 , x = $23.72

explanation:-

mean = 1220

standard deviation = 300

=> n = 160 = >   x = s / n

= 300 /160 = 23.72

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