A company asserts that 80% of the customers who purchase its special lawn mower will have no repairs during the first two years of ownership. Your personal study has shown that only 70 of the 100 lawn mowers in your sample lasted the two years without repair expenses. What is the probability of your sample outcome or less if the actual expenses-free percentage is 80%?
Answer to relevant QuestionsIt is believed that 58% of married couples with children agree on methods of disciplining their children. Assuming this to be the case, what is the probability that in a random survey of 200 married couples, we would find a. ...A large sample of lenses was randomly selected and evaluated for a particular lens dimension. It was then compared to its specification range of nominal (0.000) ± 0.030 units. One hundred ten lenses were evaluated. Data ...Examine the intelligence quotient, or IQ, as it is defined by the formula: Intelligence Quotient = 100 × (Mental Age/Chronological Age) Justify why it is reasonable for the mean to be 100. Find the area under the normal curve that lies between the following pairs of z-values: a. z = —1.20 to z = —0.22 b. z = —1.75 to z = —1.54 c. z = 1.30 to z = 2.58 d. z = 0.35 to z = 3.50 Applet Exercise demonstrates that probability is equal to area under a curve. Given that college students sleep an average of 7 hours per night, with a standard deviation equal to 1.7 hours, use the scroll bar in the applet ...
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