Question
n a certain store, there is a .03 probability that the scanned price in the bar...
n a certain store, there is a .03 probability that the scanned
price in the bar code scanner will not match the advertised price.
The cashier scans 870 items.
(a-1) What is the expected number of mismatches?
(Round your answer to the nearest whole
number.)
Expected number = 26.1 26.1 Correct
(a-2) What is the standard deviation? (Use
your rounded number for the expected number of mismatches for the
calculation of standard deviation. Round your final answer to 4
decimal places.)
Standard deviation = 5.0316 5.0316 Correct
(b) What is the approximate normal probability of
at least 21 mismatches? (Round the z-value to 2
decimal places. Use Appendix C-2 to find probabilities. Round your
final answer to 4 decimal places.)
Probability =
(c) What is the approximate normal probability of
more than 32 mismatches? (Round the z-value to 2
decimal places. Use Appendix C-2 to find probabilities. Round your
final answer to 4 decimal places.)
Probability =
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