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1. In a recent year, scores on a standardized test for highschool students with a 3.50 to 4.00 gpa were normally distributed, with a mean of 38.2 and a standard deviation of 1.8. A student with a 3.50 to 4.00 gpa who took the standardized test is randomly selected.
Find the probability that the student's test score is less than 36.
(Round to four decimal points.)
2. . The total cholesterol levels of a sample of men aged 35-44 are normally distributed with a mean of 201 milligrams per deciliter and a standard deviation of 38.8 milligrams per deciliter.
a) What percent of the men have a total cholesterol level less than 232 milligrams per deciliter of blood?
b) If 245 men in the 35-44 age group are randomly selected, about how many would you expect to have a total cholesterol level greater than 264 milligrams per deciliter of blood?
(Round to two decimal places.)
Elucidate this data use an appropriate statistical test to explain whether the population mean TV "on" time has declined in the past decade.
it is important that face masks used by firefighter be able to withstand high temperatures because firefighters
We then counted the number of statements in the summary that can be classed as inferences. Assume inferences are interval measurement.
What is the probability that the birth weight of a randomly selected baby of this type:
Suppose that in a random sample of 230 hockey players, 19 of them indicated that they are left-handed. Find the 97% Wilson estimate (plus four) confidence interval for the proportion of all hockey players that are left-handed.
Determine the mean, median and mode of those data. Make sure you show your hand computeed work. Is there any indication from this group of data that the new policy holder may lean toward younger ages?
Chicken Delight claims that 90% of its orders are delivered within 10 minutes of the time the order is placed. A sample of 100 orders revealed that 82 were delivered within the promised time.
What control limits should be applied to his sample?
A sample of 140 golfers showed that their average score on a particular golf course was 93.38 with a standard deviation of 4.36. Answer each of the following (show all work and state the final answer to at least two decimal places.):
The population (in millions) and the violent crime rate (per 1000) were recorded for 10 metropolitan areas. The data are shown in the following table.
State the relevant hypotheses to test claim
The planner randomly selected 1000 orders and found that 180 orders were shipped late. Construct the 99% confidence interval for the proportion of orders shipped late.
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