MTH 240-41H Test: Unit 3 Test (Ch 8-10) This : 4 pts This Test: 105 pt (a) what

Question

MTH 240-41H Test: Unit 3 Test (Ch 8-10) This : 4 pts This Test: 105 pt (a) what must betrua regran medittoon of the poplation in order to use the normal to (c) Assuming the noemal model can be used, determine P(x 264.4) (a) What must be true regarding the distribution of the population? O A. The sampling distribution must be assumed to be nomal B. Te populaion must be normaly distributed and the O C. Since the sample size is large enough, the population distribution does not O D. The population must be normally distributed A. Normal, with k," 63 and ," OR, Normal, with .63 ad (b) PCO66.5)-Rand to fur decimal places as needed) (c)Px 2644)-(Round to four decimal places as needed

Explanation / Answer

a) option D is correct

b)option B is correct

c)

std error =16/sqrt(!3) =4.4376

b)therefore P(Xbar<66.5)=P(Z<(66.5-63)/4.4376)=P(Z<0.7887)=0.7849

c)P(Xbar>64.4)=P(Z>(64.4-63)/4.4376)=P(Z>0.3155)=0.3762

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