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Assume the speed of vehicles along a stretch of I-10 has an approximately normal distribution with a mean of 71 mph and a standard deviation of 8 mph. The current speed limit is 65 mph. What is the proportion of vehicles less than or equal to the speed limit?
What proportion of the vehicles would be going less than 50 mph?
A new speed limit will be initiated such that approximately 10% of vehicles will be over the speed limit. What is the new speed limit based on this criterion?
In what way do you think the actual distribution of speeds differs from a normal distribution?
At the 5 percent level of significance, does this sample prove a violation of the guideline that the average patient should pay no more than $250 out-of-pocket? State your hypotheses and decision rule.
Find the area under the normal distribution curve to the right of z = -1.03.
For the mold described in (g), can you find the probability that it's COST value will exceed $150,000? If yes, obtain this probability. If no, why not?
An SRS of 100 of a certain popular model car in 1993 found that 20 had a certain minor defect in the brakes. An SRS of 400 of this model car in 1994 found that 50 had the minor defect in the brakes. Let p1 and p2 be the proportion of all cars of t..
The budgeting process for a Midwestern college resulted in expense forecasts for the coming year (in $ millions) of $9, $10, $11, $12, and $13. Since the actual expenses are unknown, the following respective probabilities are assigned: .3, .2, .25..
Key Refining decided to send a special financing plan to charge account customers having the highest 10 percent of the money charges. What is the dividing point between customers who receive the special plan and those who do not.
The probability that a bomber hits a target on a bombing mission is 0.700. Three bombers are sent to bomb a particular target.
If the mean IQ of all Omega University students was equal to 115, and a small random sample of students was selected from the population whose mean IQ was 120, then this difference of 5 points would equal the:
Do the thinner cans appear to be strong enough so that they are not crushed when the top lids are pressed onto the sides?
Examined the effect of body position on blood pressure
Find the probability that in a given month:
To conclude the effect of a new fertilizer on productivity of tomato plants one group of plants is treated with the new fertilizer as a second group is grown without such treatment. The number of ripe tomatoes produced by each group is counted.
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