2297 Questions for the topic statistics

14h

whatdo i do with the 4 people
IQ scores are normally distributed with a mean of 100 and a standard deviation of 15. If 4 people are randomly selected, find the probability that their mean IQ is less than 120.
Follows • 1
Expert Answers •0

17h

Histogram and Descriptives

Data of Health Insurance... more
Follows • 1
Expert Answers •0

18h

Probability of drawing cards
If I have a deck of 60 cards, 6 of which are green, if I draw 7 cards, what are the chances that 1 of them will be green?
Follows • 1
Expert Answers •0

19h

Normal Random Variables

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
Follows • 1
Expert Answers •0

19h

Normal Random Variables
A particular fruit's weights are normally distributed, with a mean of 665 grams and a standard deviation of 34 grams.The heaviest 4% of fruits weigh more than how many grams?Give your answer to the... more
Follows • 1
Expert Answers •0

19h

Normal Random Variables

A manufacturer knows that their items have a normally distributed lifespan, with a mean of 11.3 years, and standard deviation of 2 years.The 6% of items with the shortest lifespan will last less... more
Follows • 1
Expert Answers •0

19h

Normal Random Variables

Company XYZ know that replacement times for the quartz time pieces it produces are normally distributed with a mean of 12.7 years and a standard deviation of 0.8 years.Find the probability that a... more
Follows • 1
Expert Answers •0

19h

Normal Random Variables

A particular fruit's weights are normally distributed, with a mean of 701 grams and a standard deviation of 34 grams.If you pick one fruit at random, what is the probability that it will weigh... more
Follows • 1
Expert Answers •1
975150b1 b920 4681 9d91 f7e3009764ef

19h

Normal Random Variables

The mean daily production of a herd of cows is assumed to be normally distributed with a mean of 38 liters, and standard deviation of 11.5 liters.A) What is the probability that daily production... more
Follows • 1
Expert Answers •0

19h

Normal Random Variables

The lengths of pregnancies in a small rural village are normally distributed with a mean of 266 days and a standard deviation of 14 days. A distribution of values is normal with a mean of 266 and a... more
Follows • 1
Expert Answers •0

19h

Normal Random Variables

The combined SAT scores for the students at a local high school are normally distributed with a mean of 1450 and a standard deviation of 302. The local college includes a minimum score of 1299 in... more
Follows • 1
Expert Answers •0

19h

Normal Random Variables
In the country of United States of Heightlandia, the height measurements of ten-year-old children are approximately normally distributed with a mean of 56.8 inches, and standard deviation of 4.2... more
Follows • 1
Expert Answers •0

1d

Assume a class has 23 members in how many ways can a president, Vice President , and secretary be selected
Follows • 1
Expert Answers •0

1d

a gardener buys a package of seeds. 81% of this type germinate. The gardener plants 120 seeds. Approximate the probability that the number of seeds that germinate is between 89.2 and 105.2
a gardener buys a package of seeds. 81% of this type germinate. The gardener plants 120 seeds. Approximate the probability that the number of seeds that germinate is between 89.2 and 105.2
Follows • 1
Expert Answers •0

2d

Statistics & Probability

At a certain college 15% of students speak Spanish ,8% speak Italian, and 5% speak both languages. What is the probability that a random selected student speaks Spanish or Italian?
Follows • 1
Expert Answers •0

2d

If a pilot is randomly​ selected, find the probability that his weight is between 130 lb and 181 lb.
An engineer is going to redesign an ejection seat for an airplane. The seat was designed for pilots weighing between 130 lb and 181 lb. The new population of pilots has normally distributed weights... more
Follows • 1
Expert Answers •0

2d

Stats Math Question
Assume standard IQ test scores follow a normal distribution with a population standard deviation of 14 points. In estimating the mean score of a sample group, we want to be 98% certain that we are... more
Follows • 1
Expert Answers •0

3d

Mean and Median of Statistics

The masses, in kg, of a group of children are 15, 15, 11, 13, 9, 20, 15, a, 13 and 18. Given that the median mass is 0.4kg greater than the mean mass, find the possible values of a
Follows • 1
Expert Answers •0

3d

A set of normally distributed data has a mean of 3.2 and a standard deviation of .7. Find the probability of randomly selecting 30 values and getting a mean greater than 3.6.
A.0.9991B.0.0009C.0.7157D.0.2843
Follows • 1
Expert Answers •0

3d

Statistics Class
At intersections, 618 children in private vehicles were observed. MVOR use rate was 71.2% (440/618). At schools, 665 children in private vehicles were observed. MVOR use was 24.8% (165/665).... more
Follows • 1
Expert Answers •0

4d

How can you prove time between random poisson points is exponential?
How can you prove time between Random Poisson Points is exponential? I know you can derive the Poisson Distribution from exponential but i'm not sure if this is enough to prove about the time... more
Follows • 1
Expert Answers •0

4d

Statistics problem
Find the minimum sample size you should use to assure that your estimate if p will be within the required margin of error around the population p. Margin of error: 0.05; confidence level: 99%; from... more
Follows • 1
Expert Answers •0

4d

Statistics problem
Find the minimum sample size you should use to assure that your estimate if p will be within the required margin of error around the population p. Margin of error: 0.05; confidence level: 99%; from... more
Follows • 1
Expert Answers •0

4d

Statistics Word Problem
A survey found that​ women's heights are normally distributed with mean 63.6 in and standard deviation 3.7 in. The survey also found that​ men's heights are normally distributed with... more
Follows • 1
Expert Answers •0

5d

the average speed in mph of 20 randomly selected qualifiers for a race was 215.167 mph with a standard deviation of 3.12 mph. estimate the average qualifying speed with a 95% confidence interval.
Follows • 1
Expert Answers •1
1 3 4 5 6 7 … 92

Still have a question? Ask your own and get expert help!