A) P(> 84.28)
= P(( - )/() > (84.28 - )/())
= P(Z > (84.28 - 84)/(0.6/)
= P(Z > 2.88)
= 1 - P(Z < 2.88)
= 1 - 0.9980
= 0.002
B) The seller' claim appears to be accurate . The sample mean should be considered unusual because, if the seller' s claim is true, the probability of obtaining this sample mean is less than 5%.
C) 84 - 2 * 0.6 = 82.8
84 + 2 * 0.6 = 85.2
N0, because 84.28 is within 2 standard deviations of the mean for an individual board.
his Quiz: 101 pts possibl ph Your umber company has bought a machine that automalicaly hrough...
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