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Category Archives: Probability
IB HL Math 2023 October 31 Question 10 on Normal and Binomial Distribution
A farmer is growing a field of wheat plants. The height H cm of each plant can be modeled by a normal distribution with mean and standard deviation $\sigma$. It is know that P(H<94.6)=0.288 and P(H>98.1)=0.434.
IB SL Question on Marginal distribution table (Chocolate and People)
In a large city 160 people were surveyed. Of those 60 were children (C) and the rest adults (A). Each person in the survey was asked whether they preferred milk chocolate (M) or dark chocolate (D). It was found that … Continue reading
IB SL Question on bag containing red and green balls and geometric probability
A bag contains n balls. It is known that then of the balls are green and the rest of the balls are red. Balls are drawn from the bag, one after the other without replacement.
IB Math SL Biased Dice Problem 9 Paper 1 May 6 2022
A biased four-sided die with faces labelled 1,2,3 and 4 is rolled and the result recorded. Let X be the result obtained when the die is rolled. The probability distribution for X is given in the following table where p … Continue reading
AMC 8 2007 Problem 25
On the dart board show in the figure, the outer circle has a radius 6 and the inner circle has a radius 3. Three radii divide each circle into three congruent regions with point values shown. The probability that a … Continue reading
Sumant's 1 page of Math 