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# LQ4 - Name_ Date_ PHYS 360 Lecture Question#4...

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Unformatted text preview: Name:__________________________________________ Date:__________________________ PHYS 360 Lecture Question #4 You earn 1 point for answering the questions. Write in ink. If you use pencil, do not erase anything. If there are erasures, you get zero points. This is based on today’s reading assignment, Ch1.3: A group of 10 children has the following age distribution (or probability distribution P(j)): Age Number with that age 4 1 5 8 6 1 a. If you pick a child at random, what is the probability that this child is 5 years old? ∑ jN ( j ) . Calculate this. b. The mean age is defined as j ≡ ∑ jP( j ) = N c. The mean square age is j 2 ≡ ∑ j 2 P( j ) . Calculate this. d. The standard deviation is σ = j2 − j 2 . Calculate this. ...
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