Answer Happy

In-flight entertainment kits contain a headset manufactured by a local manufacturer in New York city. The airport staff state that, typically, 90% of the headsets received in a consignment are above the accepted quality standards and the faulty ones are discarded. At the time of a new delivery, you are assigned to take a random sample of 35 headsets for a quality assessment. What is the probability that you will find 8 or more faulty headsets in your sample? [1 mark] Note: Show your workings by copying and pasting a screenshot of the excel workings. Are the assumptions of the binomial distribution valid here? Discuss. (2 marks] You found four faulty headsets in the sample. Using the suitable Excel template, set up a 95% confidence interval estimate for the proportion of faulty headsets in the delivery. Write a sentence to explain the meaning of your answer. [3 marks] Note: Show your workings by copying and pasting a screenshot of your workings.