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.

Question

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%
 are those correct? 
1. is D 
2. is E 
3. is B ? 
Regards.

PsyDAG · Answer

1. right! 2. right! 3. Right!