a commercial prawn fisherman recorded the number of prawns he took from each trap. The average number of prawns per trap was 230 with a standard deviation of 22. What number of prawns per trap woud you expect in the interval symmetrical about the mean where 80% of the numbers would be found?

Question

anonymous · Answer

Look at a z table to figure out what two z-scores give 40% above and 40% below
Convert those z-scores into prawns per trap by using the mean and SD.