A coin is tossed 8 times. What is the probability that the number of tails obtained will be at least 2? Express your answer as a fraction or a decimal number rounded to four decimal places.

A baseball player has a batting average of 0.355. What is the probability that he has exactly 4 hits in his next 7 at bats? Round your answer to 4 decimals. The probability is Show your work. Show what you entered into the calculator.

John runs a computer software store. Yesterday he counted 132 people who walked by the store, 69 of whom came into the store. Of the 69, only 23 bought something in the store. (Round your answers to two decimal places.)  Estimate the probability that a person who walks by the store will enter the store.

Camilia sets up a passcode on her tablet, which allows only nine digit codes. A spy sneaks a look at Camilia's tablet and sees her fingerprints on the screen over nine numbers. What is the probability the spy is able to unlock the tablet on his first try? Express your answer as a fraction in lowest terms or a decimal rounded to the nearest millionth.