Homework Answers
P(exactly one of them got a mark above 70) =P(one gets above and other one below 70)
=2*(6*18)/(24*23) = 0.3913
option C is correct
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Math 6 SL Probability Distributions Practice Test Questions
Let X be normally distributed with mean 100 cm and standard deviation 5 cm.
(a) On the diagram below, shade the region representing P(X > 105).
(2)
(b) Given that P(X < d) = P(X > 105), find the value of d.
(2)
(c) Given that P(X > 105) = 0.16 (correct to two significant figures), find P(d < X < 105).
(2)
(Total 6 marks)
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