Use the distribution in the form of the stem-leafplot.

Stem      Leaves

1                1478

2             01237888

3                 189         

16/ The mid-point of the third class is

A./   32   B/   36C/    34.5 D/   35

17/ The median is

A./   24 B/  23 C/ 25   D/5

18/ The relative frequency for the third classis:

A./   20%   B/  50%C/    66% D/   40%

19/ The heights of a group of professional basketballplayers are summarized in the frequency distribution below. Findthe mean height from this frequency table.

Height s (in)          Frequency

70-72                           4

73-75                           6

76-78                           8

79-81                           2

A./   75.2 in   B/  76.8 inC/    74.0 in D/   77.5in

20/ The temperatures ( in ºF ) in a room is recorded atthe top of hours are

67, 68, 70 , 5, 77, 77, 78, 80, 78, 79, 74, 74. Choosebest answer:

a/  It is a typo

b/  highest temperature is probably95

c/  5 is not an outlier

d/  5 is an outlier

21/ The variance of 6 washing machines withprices:  $ 800, $784, $ 1,235, $860, $1,036 and $770is

A/ 196.4 B/   34,295.3 C/ 26,002.7 D/185.2

22/ The coefficient of variation ( round to closest %) forthe set of data  :

1, 3, 3, 5, 5, 6, 7, 8, 9 ,12, 15,24  is

A   74% B/ 67% C/ 24% D/ 78 %

23/ Human body temperatures have the mean of98.2º  and a standard deviation of 0.6º.

Amy’s temperature can be described by z = 0.9. What isher temperature?

A/ 98.2º B/ 97.8º C/   98.7º D/99.3º

24/ The upper bound for the outlier for the dataset

-11, 14, 22, 22, 22, 23, 31, 31, 42, 44, 44,75    is

A/  74.5 B/  75 C/ 84 D/  68

  

25/ The box-plot of a data with 5- point summary  2, 6, 8, 11, 18

A/is positive skewed. B/ is negative skewed.

C/ is symmetric D/ perfect skewed