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1.A fair coin is flipped 100 times. Find the mathematical expectation of the number of heads. 2. Someone has stolen a bank card and wants

1.A fair coin is flipped 100 times. Find the mathematical expectation of the number of heads.

2.Someone has stolen a bank card and wants to use it at an ATM. PINS are designed to contain four numbers (0 through 9). ATM machines are designed in a way that after the first three attempts to log in using a wrong PIN, a bank card stays with a machine.

What is the probability that a thief will guess correctly the PIN at his third attempt?

i have attached 3 /4 and 5.

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