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An English instructor gave a final exam and found a mean score of 73 points and a standard deviation of 5.8 points. assume that a normal model can be applied.
a. What is the probability that a randomly selected student made an A? (scored 90 or above)
b. What is the probability that a randomly selected student will fail?
apples market share in the smart phone market represents a proportion of 0.1835. if apple conducts a survey nationwide
a politician is concerned with winning an upcoming election. what null hypothesis is he testing if he commits a type i
an oil drilling company ventures into various locations and its success or failure is independent from one location to
if a data set has an even number of observations the mediana. is the average value of the two middle itemsb. is the
Four customers in succession come into the store to order stereos. The retailer is interested in their preferences. List the possibilities for preference arrangements among the four customers.
Assume that the measurements came from a normal distribution. The variability of the manufacturing process is unknown means the same as the standard deviation is unknown.
the managers of a brokerage firm are interested in finding out if the number of new clients a broker brings into the
An orange juice producer buys all their oranges from one particular orchard. The amount of juice from the oranges is approximately normally distributed with a mean of 152 ml. and a standard deviation of 41 ml.
Suppose that the two lists are combined to produce a new list of 18 values. What is the average (mean) of this new list?
two cards are drawn from a well-shuffled deck of playing cards from which the spades and clubs have been removed and
Let X be the number of tumors in a fish living in a river. Suppose that it has the following probability mass function f(0) = 0.9 f(1) = 0.7 f(2) = 0.02 f(3) = 0.01 A random sample of size n = 30 is selected from this population. Approximate the p..
one environmental group did a study of recycling habits in a california community. it found that 73 of the aluminum
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