Posted by **olek** on Sunday, May 8, 2011 at 4:27pm.

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 -
**Reiny**, Sunday, May 8, 2011 at 4:45pm
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 -
**olek**, Sunday, May 8, 2011 at 5:04pm
does it mean that:

1. is D

2. is E

3. is B ?

Regards.

## Answer this Question

## Related Questions

- statistics - The heights in centimetres of men in a sample selected at random ...
- math - the sample of selected men have the average weight of 180 lb with the ...
- Prob and Stats - To estimate the mean height population of male students on your...
- Math (Statistic) - Considered the sampling distribution of a sample mean ...
- Math - 1.)Suppose you interview 10 randomly selected workers and ask how many ...
- Satistics - In North American, female adult heights are approximately normal ...
- stats please help ASAP!!! - A. The GPAs of all 5540 students enrolled at a ...
- Statistics - 1. The scores of students on the ACT college entrance examination ...
- statistics - The scores of students on the ACT college entrance examination in ...
- Stats - nformation given:the distribution of male head circumference (HC) is ...