exam Maths Puzzle Numerical Ability

You have 20 grams of phosphorus-32 that decays 5% per day. How long will it take for half of the original amount to decay?

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exam Other Question

Expectation and variance of a random variable
Let be a random variable with the following probability distribution:
Value of

-2 -0.15
-1 -0.10
0 -0.35
1 -0.40
Fin Usse the variable expression 3x - 1

Evaluate the expression when x= -3, -2, -1, 0, 1, 2, and 3