ATAR Notes: Forum
VCE Stuff => VCE Mathematics/Science/Technology => VCE Subjects + Help => VCE Mathematics => Topic started by: rajah21 on September 15, 2009, 10:23:09 pm
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Hey, I'm having trouble with this question on normal distribution. This is Qn 8 from Chapter 17 Review questions in the Essential Methods textbook.
8. The weekly error (in seconds) of a brand of watch is known to be normally distributed. Only those watches with an error of less than 5 seconds are acceptable.
a) Find the mean and standard deviation of the distribution of error if 3% of watches are rejected for losing time and 3% of watches are rejected for gaining time.
b) Determine the probability that fewer than two watches are rejected in a batch of 10 such watches.
Some enlightenment would be greatly appreciated :) Thanks!