# Ch6.WS - Pr act i ce Quest i ons The Nor m Cur ve al Pr act...

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Pr act i ce Quest i ons The Nor mal Cur ve

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Pr act i ce 1. On a cer t ai n exam, t he aver age of t he scor es was 50 and t he SD was 10. ( a) Conver t each of t he scor es i nt o st andar d uni t s: 60, 45, 75 ( b) Fi nd t he scor es whi ch i n st andar d uni t s ar e: 0, +1. 5, - 2. 8 2. ( a) Conver t each ent r y on t he f ol l owi ng l i st t o st andar d uni t s ( usi ng t he aver age and SD of t he l i st ) : 13, 9, 11, 7, 10 ( b) Fi nd t he aver age and SD of t he conver t ed l i st .
#2 Fi nd t he ar ea under t he nor mal cur ve— ( a) t o t he r i ght of 1. 25 ( b) t o t he l ef t of - 0. 40 ( c) t o t he l ef t of 0. 80 ( d) bet ween 0. 40 and 1. 30 ( e) bet ween - 0. 30 and 0. 90 ( f ) out si de 1. 5 and - 1. 5

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( a) Fi nd t he aver age and SD of t he l i st 1, 3, 4, 5, 7 ( b) Take t he l i st i n par t ( a) , mul t i pl y each ent r y by 3 and t hen add 7, t o get t he l i st 10, 16, 19, 22, 28. Fi nd t he aver age and SD of t hi s new l i st . Can
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## This note was uploaded on 03/14/2010 for the course ECON Statistics taught by Professor Yy during the Spring '10 term at Seoul National.

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Ch6.WS - Pr act i ce Quest i ons The Nor m Cur ve al Pr act...

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