# Four fair coins are thrown and the number of heads are counted. What are the chances that 0, 1, 2, 3, and 4 heads are obtained? The experiment is repeated 128 times. Draw a table to show the numbers of throws one could expect to give 0, 1, 2, 3 and 4 heads

a) The length in centimeters of twelve rods are as follows: Find the mean
value and standard deviation. 5.33, 5.31, 5.33, 5.22, 5.29, 5.34, 5.35, 5.31,
5.27, 5.28, 5.32, 5.25 ( 7 marks)

b) Four fair coins are thrown and the number of heads are counted. What are
the chances that 0, 1, 2, 3, and 4 heads are obtained?

The experiment is repeated 128 times. Draw a table to show the numbers
of throws one could expect to give 0, 1, 2, 3 and 4 heads. (8 marks)

c) Ten percent of articles from a machine are defective. In a sample of 12
what is the chance that there will be three defectives? (5 marks)

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