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The probability that an appliance is currently being repaired is .5. If an apartment complex has 100 such appliances, what is the probability that at least 60 are currently being repaired? Use the normal approximation to the binomial.

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Introductory Statistics
OER Edition, 2013
Openstax
ISBN: 9781938168208

Related questions

3. An important part of the customer service responsibilities of a cable company relates to the speed with which trouble in service can be repaired. Historically, the data show that the likelihood is 0.85 that troubles in a residential service can be repaired on the same day.  Use the binomial formula to calculate.

  1. For the first five troubles reported on a given day, what is the probability that: All five will be repaired on the same day? 
  2. For the first five troubles reported on a given day, what is the probability that: Fewer than two troubles will be repaired on the same day? 
  3. For the first five troubles reported on a given day, what is the probability that: At least 3 troubles will be repaired on the same day. 
  4. Find the mean number of troubles repaired on the same day? 
A simple random sample from an infinite population is a sample selected such that:
a. each element is selected independently and from the same population.
b. each element has a 0.5 probability of being selected.
c. each element has a probability of at least 0.5 of being selected.
d. the probability of being selected changes.
According to a report from the District Health Secretariat of Barranquilla, the patients who suffer from measles, if they are cared for in a health center, the 2/5 are cured after 20 days. Understanding that the cure of one person is an independent event of the cure of another, of three patients who are currently in the health center, calculate:

a) The probability of being cured at least 1
b) The probability that at least 2 are cured

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