**Unformatted text preview: **AP Statistics Ch 2 Review ' Name K6 2) Per: Use the following to answer questions 1-3: .ﬁ O I 15 2'
1. IIEIH a ensity curve, what percentage of the observations lies above 1.5?
b) 50%.
c) 75%.
d) 80%. 2. For this density curve, which of the following is true?
a) It is symmetric.
b) The total area under the curve is 1.
c) The median is 1. @f the above. 3. For the density curve shown, what percentage of the observations lies between 0.5 and 1.2?
a 2 ° ‘3 3332: (50(5) .— 33'
d) 70%. 4. Items produced by a manufacturing process are supposed to weigh 90 grams. The manufacturing process is
such, however, that there is variability in the items produced and they do not all weigh exactly 90 grams. The
distribution of weights can be approximated by a normal distribution with mean 90 grams and a standard
deviation of 1 gram. Using the 68—95—99? rule, what percentage of the items will either weigh less than 87
grams or more than 93 grams? a) 6%.
b) 94%. 6 9.90.734-
d) 0.3%. 5. Using the standard normal distribution tables, what is the area under the standard normal curve
corresponding to —O.5 < Z < 1.2? ‘
a) 0.3085.
b) 0.3349. ...

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