Test 7, Unit 6 Flashcards Preview

8th Math - Pre-Algebra > Test 7, Unit 6 > Flashcards

Flashcards in Test 7, Unit 6 Deck (25):
1

collection of facts; information

 

data

2

difference between highest and lowest statistics

 

range

3

drawing that uses a scale to represent distance or size

 

scale drawing

4

each part of a circle graph

 

sector

5

number expressed as a fraction which expresses the likelihood of the occurence of an event

 

probability

6

numerical data that are collected, classified, and tabulated

 

statistics

7

picture that illustrates data

 

graph

8

write the range of 52; 83; 69; 39

83 - 39 =

44

9

Find the distance between two cities that are 2 inches apart on a map that uses the scale 1/4 in. = 50 mi.

 

1/4       2

____  =  ____

50       x

1/4x = 100

x = 100 x 4

x = 400

10

Write the probability that the letters BR would be the first two letters in a code that is chosen at random.

 

1/26 for B & 1/26 for R, so multiply them for the total probability

1/26 x 1/26 = 1/676

11

Find the mode of 14, 12, 9, 12, 7, 9, 11, 12, 6, 7

 

12

12

The name of the graph that uses pictures to illustrate data.

 

Pictograph

13

name of the graph that deals with frequency

 

histogram

14

The the mean of 23, 28, 24, 25

 

add them & get 100

100 divided by 4 is 25

15

Find the median of 93, 87, 90, 74, 77, 95, 88, 81, 99

 

88

16

the number of degrees in a circle

 

360*

17

the name of the graph that shows the relationship between the parts of a whole

 

circle graph

18

Find the mean, median, mode & range of

6,3,5,2,7,8,4

 

mean 5

median 5

no mode

range 6

19

If there are 3 green marbles and 4 blue marbles in a box, what is the probability that you would pick a blue marble?

 

4/7

20

If a student thinks of a number from 1 to 75, what is the probability that the number will be 20, 30, or 40?

 

3/75

reduce to 1/25

21

Sam made 84% on a science test.  The test had 25 questions of equal point value.  How many questions did sam miss?

 

100 total points divided by 25 questions make the questions worth 4 points each.

Sam made 84, so he got 16 points counted off.

16 divided by 4 = 4 questions missed.

22

A map has a scale 1/2 in. = 60 mi.  If two cities are 2 inches apart on the map, how many miles separate the cities?

 

1/2 / 60 = 2/x

1/2 x = 120

x = 120 x 2

x = 240

23

Find the distance between two cities on a map if the scale used is 1/2 in = 20 mi. and the cities are 55 miles apart.

 

1/2 / 20 = x / 55

20x = 27.5

x = 1.375 = 1 3/8 in.

24

Find the length of the actual object if the scale for the drawing is 1/4 in. = 10 ft. and the scaled side is 7 in.

 

1/4 / 10 = 7 / x

1/4x = 70

x = 70 x 4

x = 280 ft.

25

An architect uses the scale 1/2 in. = 1 yd. to make his blueprint for a building.  If he draws a line segment 4 1/2 inches long, what actual size does it represent?

 

1/2in. / 1 yd =  4.5/x

1/2x = 4.5

x = 4.5 x 2

x = 9 yd.