exam Maths Puzzle Numerical Ability

You scored 88.7, 91.2, and 94.6 on your last three test scores. Find the standard deviation of your test scores.
A. 0.95
B.1.22
C.2.42
D.4.35

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exam Other Question
If 40 mg of a radioactive substance decays to 5mg in 12 minutes, find the half-life, in minutes, of the substance. Solve the system of equation
5x+y=12
2x=3y-19