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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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