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The possibility is always fifty percent.
1/5 and 1/2.............. 1/10 of getting both in a row
The probability of getting 3 or more heads in a row, one or more times is 520/1024 = 0.508 Of these, the probability of getting exactly 3 heads in a row, exactly once is 244/1024 = 0.238
It is 1/(2^4) i.e. 1/16 This is because there is 1 in 2 chance of it happening once, and multiply by itself for each successive go.
A random sample of size 36 is taken from a normal population with a known variance If the mean of the sample is 42.6. Find the left confidence limit for the population mean.