# maths

posted by .

The heights in centimetres of men in a sample selected at random may be modelled by a normal distribution with mean 180.5 and standard deviation 11.3.
1 Choose the option that is closest to the value above which 30% of the heights of men will lie.
Options for Question1
A 174.57 B 180.32 C 180.50 D 186.43 E 198.33 F 200.50
2 Choose the option that is closest to a range of values,symmetric
about the mean, within which the heights of approximately 80% of
men will lie.
Options for Question 2
A (157.0, 194.0) B (159.2, 201.8) C (167.8, 193.2) D (163.0, 198.0) E (166.0, 195.0) F (168.7, 192.2)
3 Choose the option that is closest to the percentage of heights of men below 170 cm.
Options for Question 3
A 17% B 18% C 19% D 40% E 41% F 42%

• maths -

Use the second applet for your question

http://davidmlane.com/hyperstat/z_table.html

It is more accurate than tables and you don't even have to convert to z-scores.

• maths -

does it mean that:
1. is D
2. is E
3. is B ?
Regards.

## Similar Questions

1. ### Math (Statistic)

Considered the sampling distribution of a sample mean obtained by random sampling from an infinite population. This population has a distribution that is highly skewed toward the larger values. a) How is the mean of the sampling distribution …
2. ### stat

the average number of pushups a United States Marine does daily is 300, with a standard deviation of 50. A random sample of 36 marines is selected. What is the probability that the sample mean is at most 320 push-ups?
3. ### Prob and Stats

To estimate the mean height population of male students on your campus, you will measure and SRS of students. Heights of people the same sex and similiar ages are close to normal. You know from government data that the standard deviation …
4. ### Satistics

In North American, female adult heights are approximately normal with a mean of 65 inches and a standard deviation of 3.5 inches. a.) If one female is selected at Random, what is the probablility that shes has a height 70 inches or …
5. ### Math- Statistics

A random sample of size 36 is to be selected from a population that has a mean μ = 50 and a standard deviation σ of 10. * a. This sample of 36 has a mean value of , which belongs to a sampling distribution. Find the shape …
6. ### Statistics

1. The scores of students on the ACT college entrance examination in a recent year had a normal distribution with a mean of 18.6 and a standard deviation of 5.9. A simple random sample of 60 students who took the exam is selected for …
7. ### statistics

The heights in centimetres of men in a sample selected at random may be modelled by a normal distribution with mean 180.5 and standard deviation 11.3. 1. Choose the option that is closest to the value above which 30% of the heights …
8. ### statistics

random sample of n = 16 scores is selected from a normal distribution with a mean of μ = 50 and standard deviation of σ = 10. a. what is the probability that the sample mean will have a value between 45 and 55?
9. ### math

the sample of selected men have the average weight of 180 lb with the standard deviation of 30 lb. For a 0.95 degree of confidence find confidence interval for the mean of the whole population, assuming the normal weight distribution …
10. ### Statistics

Suppose the heights of 18-year-old men are approximately normally distributed, with mean 66 inches and standard deviation 4 inches. (a) What is the probability that an 18-year-old man selected at random is between 65 and 67 inches …

More Similar Questions

Post a New Question