07/12/21

An online used car company sells second-hand cars. For 30 randomly selected transactions, the mean price is 2300 dollars.
An online used car company sells second-hand cars. For 30 randomly selected transactions, the mean price is 2300 dollars.Part a) Assuming a population standard deviation transaction prices of 290... more
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07/10/21

stat help please
A random sample of 130 human body temperatures, provided by Allen Shoemaker in the Journalof Statistical Education, 65 were male and 65 were female. The means and standard deviationof their... more
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07/10/21

Construct a confidence interval at a 98% confidence level.
In a survey, 20 people were asked how much they spent on their child's last birthday gift. The results were roughly bell-shaped with a mean of $47 and standard deviation of $6.
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07/10/21

Looking for an excel formula
Engineers must consider the breadths of male heads when designing helmets. The company researchers have determined that the population of potential clientele have head breadths that are normally... more
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07/09/21

The three numbers
The sum of three numbers is 86 The third number is 3 times the first. The first number is 9 more than the second. What are the numbers
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07/09/21

What is the probability that a randomly chosen child has a height of less than 52.65 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 55.4 inches, and standard deviation of 2.1... more
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07/09/21

Find the probability that a sample of size n = 85 is randomly selected with a mean less than 970 dollars. P(M < 970) =

CNNBC recently reported that the mean annual cost of auto insurance is 975 dollars. Assume the standard deviation is 245 dollars. You take a simple random sample of 85 auto insurance policies.
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07/09/21

Find the probability that a single randomly selected value is less than 970 dollars. P(X < 970) =
CNNBC recently reported that the mean annual cost of auto insurance is 975 dollars. Assume the standard deviation is 245 dollars. You take a simple random sample of 85 auto insurance policies.
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07/09/21

P(z < c) = 0.6915
find c P(z < c) = 0.6915
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07/08/21

Apples lose 85% of their weight while drying. What weight of fresh apples do you need to pick in order to get 10.5 lb of dried apples.
Apples lose 85% of their weight while drying. What weight of fresh apples do you need to pick in order to get 10.5 lb of dried apples.
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07/08/21

For a 4-unit class like Statistics, students should spend average of 12 hours studying for the class.

For a 4-unit class like Statistics, students should spend average of 12 hours studying for the class. A survey was done on 20 students, and the distribution of total study hours per week is... more
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07/08/21

From this density, the probability that X is at least 0.36 is
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07/08/21

From this density, the probability that X is between 0.26 and 1.84 is
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07/07/21

A binomial experiment consists of 18 trials. The probability of success on trial 11 is 0.42. What is the probability of failure on trial 15?
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07/07/21

Find P90, the 90-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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07/07/21

For a standard normal distribution, find: P(-0.04 < z < 2.97)
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07/07/21

Adult men have heights with a mean of 69.0 inches and a standard deviation of 2.8 inches. Find the z-score of a man 71.2 inches tall.

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07/06/21

Maths questions
At a certain store the manager has determined that 40% of customers pay cash and 60% of customers pay by debit card. (No other method of payment is accepted, and no one is allowed to pay with both... more
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07/04/21

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.
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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07/04/21

One urn contains 4 white balls, 4 black balls, and 4 red balls. 6 balls are removed from that urn. Determine the probability of 2 balls of each color being drawn.

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06/29/21

Probability Question......
I have this probability question that is driving me bonkers.....The probability that a high school senior owns a laptop is 0.6. The probability that a high school senior owns a car is 0.2. The... more
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06/27/21

Help on statistics question
The claim is that the proportion of peas with yellow pods is equal to 0.25​ (or 25%). The sample statistics from one experiment include 420 peas with 93 of them having yellow pods. Find the value... more
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06/26/21

Find the margin of that corresponds to a sample of size 24 with a mean 63.7 and a standard deviation of 15.9 at a confidence level 90%.
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06/26/21

A movie theater has a seating capacity of 225. The theater charges $5.00 for children,
A movie theater has a seating capacity of 225. The theater charges $5.00 for children, $7.00 for students, and $12.00 of adults. There are half as many adults as there are children. If the total... more
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06/26/21

Noelle has 39 coins in her pocket, all of which are nickels and quarters.
Noelle has 39 coins in her pocket, all of which are nickels and quarters. If the total value of her change is $5.35, how many nickels and how many quarters does she have?Number of nickels that... more
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