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Weighing bean seeds. Biological measurements on the same species often follow a Normal distribution quite closely. The weights of seeds of a variety of winged bean are approximately Normal with mean 525 milligrams (mg) and standard deviation 110 mg.
(a) What percent of seeds weigh more than 500 mg?
(b) If we discard the lightest 10% of these seeds, what is the smallest weight among the remaining seeds?
Standard deviation was $15.50. For 56 Model B ovens, the mean repair cost was $85 and the standard deviation was $30. At alpha=.01, would you buy Model A?
Test the whether the attitude toward keeping weight down associated with smoking status.
A sample, in hour's of life, is as follows:: 123, 116, 122, 110, 180, 126, 125 Find all Measures of Location (Central Tendency) and Measures of Variability (Dispersion or Variation).
If appropriate, use the Marascuilo procedure and α = .01 to determine which, if any, year groups are significantly different in the proportion of passengers who book tickets online.
Construct a bar and pie chart to graphically display these data by using Microsoft excel.
Find the probability that the mean weight of those loads is less than 44.24 tons. Assume that the variable si normally distributed.
Five have a 3/10,000 chance for failure. Four have a 4/10,000 chance for failure. One componet has a 1/100 chance for failur. What is the overall reliability of the product?
A survey of 600 non-fatal accidents showed that 111 involved the use of a cell phone. Find a point estimate for p, the population proportion of accidents that involved the use of a cell phone.
A mortar shell is s feet above the ground after t seconds, where s=f(t)= -16t + 510t +63. Find the height of the shell 15 seconds after it is fired.
An emergency program set up by the state. approximate the probability that the intersection in question will come under the emergency program at the end of the next year.
Standard deviation of 14 inches. What is the probability that the mean annual snowfall will be between 70 and 80 inches.
About 72% of dog owners buy holiday presents for their dogs. Suppose n = 4 dog owners are randomly selected. Find the expected number of persons, in the sample, who buy their dog holiday presents.
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