Calculate the mean and standard deviation

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In Australia, 30% of the population has blood type A +. Consider X, the number having A + blood among 18 randomly-selected Australians. (a) What is the probability distribution of X? [3] (b) Calculate: (i) the mean and standard deviation of X. [3] (ii) P(X > 12) [2] (iii) P(5 ≤ X < 10) [2] (c) If, in such a sample, you found only 5 people with A + blood, would this be an unusual sample? Justify your answer using an appropriate probability calculation

Reference no: EM133245341

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