Probability question

An exam consists of six "true or false" questions. what is the probability that a person can get five or more correct by just guessing?

Probability

Forty percent of a particular model of car are silver. What is the probability that in the next 10 observations of this model you observe 5 silver cars?

Probability

A coin is tossed until four heads occur. What is the probability that the fourth head occurs on the tenth toss?

Determine probability

In a carnival game the players selects two coins from a bag containing two silver dollars and six slugs. Write down the probability distribution for the winnings and determine how much the player would have to pay so that he would break even, on the average, over many repetitions of the game.

Variance and standard deviation

Two golfers recorded their scores for 20 nine-hole rounds of golf. Golfer A's scores were: 39, 39, 40, 40, 40, 40, 40, 40, 41, 41, 41, 41, 41, 41, 41, 42, 43, 43, 43, 44. Golfer B's Scores were: 40, 40, 40, 41, 41, 41, 41, 42, 42, 42, 42, 42, 43, 43, 43, 43, 43, 43, 44, 44. (a) Compute the sample mean and the varience of each golfer's scores. (b) Who is the better golfer? Golfer A or Golfer B (the lower score is better) (c) Who is the more consistent golfer?