In 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 780 items.
(a-1) what is the expected number of mismatches? (round your answer to the nearest whole number.) expected number
(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
(b) what is the approximate normal probability of at least 18 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