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.

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