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The qualifying speed for a championship race is 145.65 mph and the standard deviation is 9.45 mph. Only drivers who obtain z-scores greater than 1.2 will qualify for the race. If the speeds are normally distributed, what minimum speed must be clocked to compete for the trophy?
If 60 percent of those people chewing the gum are successful in stopping smoking, what is the probability that in a group of four smokers using the gum at least one quits smoking?
a researcher claims that the average age of people who buy lottery tickets is 61. a sample of 30 is selected and their
1.one characteristic of billiard balls is their elasticity - the bounce they get when striking one another. a
Tthe true population mean when different samples of the same size are taken. Note that the variability of the sample mean is LESS than that of individual observations Does this makes sense?
A woman has n keys, of which one will open her door. (a) if she tries the keys at random, discarding those that do not work, what is the probability that she will open the door one her kth try?
A sample of 50 retirees is drawn at random from a normal population whose mean age and standard deviation are 75 and 6 years, respectively.
Write the regression equation approximately. Computed the coefficient of determination(r 2 ).
What is the approximate probability that the average weekly postage expense for the past 52 weeks will exceed the budgeted amount of $ 400?
The average hourly wage of employees of a certain company is $9.83. Assume the variable is normally distributed.
State your hypothesis, draw your curves, label your critical values and your test statistic, state your decision to accept or reject and write your conclusion in the language of the problem. Use a=0.05.
Rhe frequency distribution summarizes a sample of times (in minutes) between eruptions of a cretain geyser. Find the approximate population mean and approximate population standard deviation of the data.
question the water sports company soon will be producing and marketing a new model line of motor boats. the production
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