GRE Question, part b. My answer is 16%, but the book says 15%. Why?
mean = 65 cm stdev = 5 cm
Probability that penguin chosen at random will be less than 60 cm is 16%, it shows in Normal Distribution graph. Why would the book say it is 15%
Update
During GRE, we can use standard calculator, i.e no scientific calculator. And I don't believe they will provide standard distribution table.
Kindly explain how to DERIVE the 15%, I wish to understand the mathematics.
The percentages shown in your diagram are only approximates. To more significant figures your answer should be 15.866..% so both your answer and the book answer are just rounded differently.
If you look at the question it states: "Give your answer to the nearest 0.05."