Question

Consider the following information about three populations:

Red Salmon:
mean= 12 lbs. standard deviation= 3 lbs.
% of salmon > 18lbs. = 20%
% of salmon < 6 lbs. = 10%

Blue Salmon:
mean= 15 lbs. standard deviation= 5 lbs.
% of salmon > 25 lbs. = 2.5%
% of salmon< 10 lbs. = 16%

White salmon:
mean= 16 lbs. standard deviation= 4 lbs.
% of salmon > 18 lbs. = 30%
% of salmon < 10 lbs.= 30%


Which of the following populations may be normally distributed?

A. Blue salmon only
B. White salmon only
C. Red and white salmon
D. Red salmon only
E. None of the above

Answer 1

@perl

Answer 2

I think we can use the empirical rule here

Answer 3

in a normal distribution, we have

Answer 4

oh ok, so wouldn't the only one that fell under the empirical rule be the blue salmon because it falls in 2.5%