Find the value of the standardized z-test statistic and the area above 140 for a N (160,25) distribution. Round your answer to three decimal places. A) z = - 0.8, area = 0.212B) z = - 0.8, area = 0.788 C) z = 0.8, area = 0.212 D) z = 0.8, area = 0.788

Question

Liberty Welch

Mathematics

27 April, 20:13

Find the value of the standardized z-test statistic and the area above 140 for a N (160,25) distribution. Round your answer to three decimal places. A) z = - 0.8, area = 0.212B) z = - 0.8, area = 0.788 C) z = 0.8, area = 0.212 D) z = 0.8, area = 0.788

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Answers (1)

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Pierce Durham · Answer 1

B

Step-by-step explanation:

standard z-test statistic=x-mean/standard deviation

N (160,25) ⇒N (mean, standard deviation)

mean=160

standard deviation=25

x=140

z=140-160/25=-20/25=-0.8

area above 140=P (z>0.8) = P (-0.8
so z=-0.8, area=0.7881