John and Smart Sally each need to do their homework. As this is Stats homework, they will need to be able to write, calculate, and read the problems. John likes to write with a pencil but his are too dull and he usually can only find a way to sharpen them 75% of the time. On the other hand 80% of the time at least one pen is working and that will do also. To compute, he can use his cell phone, or a calculator. The chance of the calculator working is 90% and of the cell phone working and
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