MT1 Solution B

# MT1 Solution B - II 1I You are allowed one 1(25 points Let...

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I1 Section:- - - - - - - - - - - - - - - - - - Statistics 13-A, Fa11 2009 I I ~ibterm One - Version B I You are allowed one sheet of notes, front and back, and a 1. (25 points) Let X - ~(20,5) I I (a) (5 points each) FC~ the following probabilities i. P(X > 20) 0.4 -- 3cy o!&g i = fi T 17 6~2 (b) (5 points) Find the value s so that P(X < s) = 0.9505 I I

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2. (15 pdintd 5 points each) Use the following probability distribution of the numbkr of dogs per household to answer the questions below. I I X = number of dogs I 0 1 2 3+ P(X) 1 0.5 0.3 0.05 0.15 Let A - > 1) and B = {X 2 2). (b) sup*ose we know a family has at least one dog. What is the proba- +lit): they have at least a second? (c) kre h and B independent? Show your work. A. F- + (A\ d 0-A
~LL 3. (20 points) 'ItKenty-mtudents were asked how long they spent studying for this exam. Their rksponses, in hours, are given below: (a) (10 points) ~keatb the five-number summary for the above data set , XL~I)+~L.l.) - (5-+ IL M;n : q~ / = 'C.5 /~t-d. - - t 2. ,hx:fY~ (b) (5 points) Create a boxplot of the data I I (c) (5 points) Is khe Lean greater than, less than, or approximately equal to, the medic?

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MT1 Solution B - II 1I You are allowed one 1(25 points Let...

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