07/22/21

What is the probability that a randomly chosen child has a height of more than 68.9 inches?
In the country of United States of Heightlandia, the height measurements of ten-year-old children are approximately normally distributed with a mean of 53.1 inches, and standard deviation of 6.9... more
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07/22/21

What is the probability that a randomly chosen child has a height of less than 47.15 inches?
In the country of United States of Heightlandia, the height measurements of ten-year-old children are approximately normally distributed with a mean of 53.1 inches, and standard deviation of 6.9... more
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07/22/21

If you would like to limit the margin of error of your 95% confidence interval to 25 points, how many students should you sample?
SAT scores are distributed with a mean of 1,500 and a standard deviation of 300. You are interested in estimating the average SAT score of first year students at your college.
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07/22/21

Find P65, the 65-percentile.

Assume that the readings at freezing on a batch of thermometers are normally distributed with a mean of 0°C and a standard deviation of 1.00°C. A single thermometer is randomly selected and tested.... more
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07/22/21

Find the z-score of a man 76.6 inches tall.
Adult men have heights with a mean of 69.0 inches and a standard deviation of 2.8 inches
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07/22/21

From this density, the probability that X is between 0.6 and 1.86 is:
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07/22/21

Using the 68-95-99.7 rule, what is the approximate percentage of lightbulb replacement requests numbering between 26 and 41?
The physical plant at the main campus of a large state university recieves daily requests to replace florecent lightbulbs. The distribution of the number of daily requests is bell-shaped and has a... more
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07/22/21

If Roberto scored 80, what was his z-score?
On a nationwide math test, the mean was 75 and the standard deviation was 4.
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07/22/21

What is the probability that all three prizes go to women?
Party guests are each given a number at the door when they come in and during the party 3 numbers will be chosen at random from a hat to win door prizes. There are 20 people at the party of which... more
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07/21/21

Geometry test..

Given sin θ = − 1/6 and angle θ is in Quadrant IV, what is the exact value of cos θ in simplest form? Simplify all radicals if needed.
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07/21/21

Geometry test..

What is the volume of a sphere with a radius of 24.2 ft, rounded to the nearest tenth of a cubic foot?
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07/21/21

What statistical test can I use?

I want to measure the increase of Fetal haemoglobin in patients in a few case studies before and after they use a specific drug. I am taking data from 5 studies, what test can I use and how can I... more
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07/21/21

Find the mean, median and mode for each set of numbers.
a {34,47,12,36,26,34,28,26,48} Mean:   Median:   Mode:b. {21,23,26,34,21,29,36,45,32,26,28,26} Mean:   Median:   Mode: c. {8,6,2,4,7,6,2,5,3,7,9,7} Mean:   Median:   Mode:
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07/21/21

What is the probability of success on trial 16?
A binomial experiment consists of 19 trials. The probability of success on trial 12 is 0.76
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07/21/21

What is the probability of showing a 1 on the first roll and an even number on the second roll?
A die is rolled twice. 
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07/21/21

If the candidate only wants a 9% margin of error at a 90% confidence level, what size of sample is needed?
If the candidate only wants a 9% margin of error at a 90% confidence level, what size of sample is needed?
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07/21/21

If the false negative rate is 8% and the false positive rate is 4%, compute the probability that a person who tests positive actually has the disease.
A certain disease has an incidence rate of 0.5%. If the false negative rate is 8% and the false positive rate is 4%, compute the probability that a person who tests positive actually has the disease.
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07/20/21

Write an equation in point-slope y - y1 = m(x - x1), form with the given information: perpendicular to y=2/3x-3 goes through (-2,4)
what would this equation look like?
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07/20/21

Find the sum of an infinite geometric sequence in which a1 = 300 and r = 3/5. Sum=? 
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07/20/21

find the probability of selecting two red cards when two cards are drawn without replacement from a standard deck of cards
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07/20/21

What number should be added to −85 to get a sum of 49
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07/20/21

Pre-Calculus Question. Please Help!
 Kate has 12 different types of flowers but she wants to make a floral arrangement with only 9 of them. How many possible flower arrangements are there?
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07/20/21

The total number of medium sailboats is an example of what type of frequency?
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07/20/21

The total number of medium sailboats is an example of what type of frequency?
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07/20/21

The total number of small boats is an example of what type of frequency?
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