F.3 Maths

1.Two dice are rolled.Find the probability that the sun of the number is equal

to or larger than 7?

2.There are mistakes in the following calculations.Correct the mistakes.

A bag contains two $5 coins,there $2 coins and four $1 coins.A coin is

drawn from the bag at random,what is the expected value of the coin?

Solution:

Expected value= $5 + $2 + $1 /3

= $2.67

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