4 marks
5.The lifespan of a particular species of turtle is normally distributed with a mean of 180 years and a standard deviation of 40 years. What is the probability that one of these turtles will live more than a century?
4 marks
6.A second species of alien has a mean height of 71 cm and a standard deviation of 5.3 cm. An alientologist discovers that 30% of them bump their heads getting into their spaceship. What is the height of the spaceship door?

NORMAL DISTRIBUTION
5
6 marks
7.In Bayfield, 65% of residents read the Bayfield Breeze, a local online blog. Dennis wants to know what people think of the blog, so he stops 40 people on the street to ask them if they read it.a.Verify that the normal distribution can be used to approximate this situation.
b.What is the mean and standard deviation of the number of people he finds that read the Breeze?
c.What is the probability that at least 25 of the people he asks read the blog?

NORMAL DISTRIBUTION
6
9 marks

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- Summer '17
- Statistics, Normal Distribution, Probability, σ