Question
Assist with these 6 HW stat questions The mean time it takes for a particular make/model of a phone to break down and require repair
Assist with these 6 HW stat questions
The mean time it takes for a particular make/model of a phone to break down and require repair services from the manufacturer is 30 months, with a standard deviation of 16 months. The manufacturer's warranty for the phone is 1 year (12 months). Assume normal distribution.
- What is the probability that the phone will break down within the warranty period and the manufacturer must cover the cost of repair?
- What is the probability the phone will function for at most 25 months?
The HR department of a local company administers a litmus test to applicants. The mean score on the test is 245 with a standard deviation equal to 35 points. Assume normal distribution.
- What is the probability that an applicant scores between 230 and 280 points?
- The manager wants to consider only those applicants who have scored in the top 5%. What score marks that cut-off point?
The time between failures for an industrial machine is exponentially distributed with a mean of 40 days.
- What is the probability that a failure occurs in the next 30 days?
- In a medical study it was found that in a specific group 35% of individuals smoked, in that same group it was found that 5% smoked and had a heart condition. What is probability that an individual in this group had a heart condition given the individual smoked?
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