单项选择题

A sample of employees were tested on data—entry skills for one hour，and the number of errors (x) they made and the percent of employees (p) making x errors were recorded as follows．

What was the median number of errors in the sample（）

A. 3
B. 3.5
C. 4
D. 4.5
E. It cannot be determined from the information given．

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单项选择题
A gardener wishes to plant 5 bushes in a straight row．Each bush has flowers of a different solid color(white，yellow，pink，red，and purple.．How many ways can the bushes be arranged so that the middle bush is the one with red flowers（）

A. 24
B. 30
C. 60
D. 96
E. 120
单项选择题
A square dart board has four dark circular regions of radius 3 inches，as shown in the design above．Each point on the dart board is equally likely to be hit by a dart that hits the board．What is the probability that a dart that hits the board will hit one of the circular regions（）

A.A
B.B
C.C
D.D
E.E
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