2,715 Answered Questions for the topic statistics

Point Estimate of the Standard Deviation

The National Football League (NFL) polls fans to develop a rating for each football game. Each game is rated on a scale from 0 (forgettable) to 100 (memorable). The fan ratings for a random sample... more

According to Masterfoods, the company that manufactures M&M’s, 12% of peanut M&M’s are brown, 15% are yellow, 12% are red, 23% are blue, 23% are orange and 15% are green.

If you randomly select four peanut M&M’s, compute that probability that at least one of them is brown.

Assume that the human body temperatures are normally distributed with a mean of 98.22F and a standard deviation of 0.62F. A hospital uses 100.6F as the lowest temperature considered to be a fever.

What percentage of normal and healthy persons would be considered to have a fever?part 2:physicians want to select a minimum temperature for requiring further medical tests. What should the... more

Determine P(5 ≤ X ≤ 8)

Determine P(5 ≤ X < 8)

EXPECTED VALUE GAMBLING WHEEL QUESTION

Suppose you bet $1 on red at the roulette wheel. There are 18 red numbers and 20 nonred numbers (including the green 0 and 00). You win $1 if a red number comes up, and you lose $1 if any other... more

Normal distribution

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

The Normal Distribution

A particular fruit's weights are normally distributed, with a mean of 726 grams and a standard deviation of 38 grams.If you pick one fruit at random, what is the probability that it will weigh... more

Probability Mass Function

Cards are selected at random and with replacement from an ordinary deck of 52 cards. Define the random variable X as the number of trials until we obtain the first ace. Give the probability mass... more

Binomial Probability Distribution

Assume that when adults with smartphones are randomly​ selected, 53​% use them in meetings or classes. If 10 adult smartphone users are randomly​ selected, find the probability that fewer than 3 of... more

What is the value of the sample test statistic? (Round your answer to three decimal places.)

The manufacturer of a sports car claims that the fuel injection system lasts 48 months before it needs to be replaced. A consumer group tests this claim by surveying a random sample of 10 owners... more

What is the value of the sample test statistic? (Round your answer to three decimal places.)

A machine in the student lounge dispenses coffee. The average cup of coffee is supposed to contain 7.0 ounces. A random sample of eight cups of coffee from this machine show the average content to... more

What is the value of the sample test statistic? (Round your answer to two decimal places.)

The Congressional Budget Office reports that 36% of federal civilian employees have a bachelor's degree or higher (The Wall Street Journal). A random sample of 119 employees in the private sector... more

What is the value of the sample test statistic? (Round your answer to two decimal places.)

The Nero Match Company sells matchboxes that are supposed to have an average of 40 matches per box, with σ = 8. A random sample of 96 matchboxes shows the average number of matches per box to... more

What is the value of the sample test statistic? (Round your answer to three decimal places.)

The Toylot company makes an electric train with a motor that it claims will draw an average of only 0.8 ampere (A) under a normal load. A sample of nine motors was tested, and it was found that the... more

Unit 11 Test Probability & Statistics

The odds of winning a game at the carnival are 3 in 7. If Liza plays the game nine times, what is the probability that she wins exactly two times?

How to apply the empirical rule (68–95–99.7 rule)

How to apply the empirical rule (68–95–99.7 rule) to the following scenario:I have spent a significant amount of time trying to do the impossible (i.e., mathematically beat a game with a negative... more

What’s the new mean of the population?

In a population of 35 scores (N=35) and a mean of M=50, a single score changed so that it’s value increased by 5 (the new value of that score=old value +5). Only one score was changed. What’s the... more
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