Three defective electric toothbrushes were accidentally shipped to a drugstore by Cleanbrush Products along with 17 nondefective ones.
a.) What is the probability the first two electric toothbrushes sold will be returned to the drugstore because they are defective?
b.) What is the probability the first two electric toothbrushes sold will not be defective?© BrainMass Inc. brainmass.com October 24, 2018, 7:17 pm ad1c9bdddf
a) Before the first unit is sold, there are 3 units among 18 that are defective. Therefore, there is a 3/18 (=0.1666) probability that the first toothbrush will be defective.
Once the first defective toothbrush has been sold, there are 2 ...
In this solution, explanation is provided along with a calculation of probability, and an Excel file is attached.
Chicken Delight order delivery speed
Chicken Delight claims that 90% of its orders are delivered within 10 minutes of the time the order is placed. A sample of 100 orders revealed that 82 were delivered within the promised time. At the 0.10 significance level, can we conclude that less than 90% of the orders are delivered in less than 10 minutes?
Please answer the questions using the excel file provided.
Questions are in excel spreadsheet , attached.View Full Posting Details