Sam is practising eethrows in basketball. She has a 4f5 chance of scoring each time she shoots from the freethrow line. {You should assume that the probability of scoring for each shot is independent of the result of other attempts.) What is the expected value of the number of freethrows that Sam will score before her rst miss? |:| What is the variance of the number of free-throws that Sam will score before her first miss? |:|