Page 460 - Math Smart - 7

110<x< 120 3
Unit 18
120 <x< 130 2
Recall (Pg 417)
130<x< 140 3
a) Equally likely b) Unlikely c) Equally likely d) Certain
140 <x< 150 1
150<x< 160 3
Check My Understanding (Pg 418)
160 <x< 170 1
1. a) false. The sock is most likely pink.
170 <x< 180 1 b) false. The sock is never green.
c) true
b) 110 < X < 120 and 130 < x < 140 and 150 < x < 160
d) false. The sock is more likely to be yellow than blue.
c)2
e) true
d) 29.41%
2. a) 1 out of 6 b) 1 out of 6 c) 1 out of 6
e) The data is quite evenly distributed across a wide
d) 1 out of 6 e) 1 out of 6 f) 1 out of 6
range as the median is around the middle of the
range
Check My Understanding (Pg 420)
7. Yes
a) impossible b) Unlikely c) Certain
8. a) Mean as the data does not have huge outliers d) impossible e) Certain f) Likely
b) Median as the data Is spread Inconsistently g) Certain h) Equally likely i) Unlikely
c) Mean as the data does not have much spread
j) Certain
9. a) $34714.28
b)$27000 Check My Understanding (Pg 421)
c) The Median as there is an outlier that skews the
1. A
mean by an amount
10. a) Week 1 b) 28 c) 24
d) Draw 3 large squares and 3 small squares I ^ ^ ^ ^ 1
11, a) Draw a histogram as it allows the frequency to be 0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8 0.9
displayed in a manner where it is easy to read
Age in Years 2. a) F b) D c) A d) E e) D f) C
Elephant (0.12)
Lion (0.06) Antelope (0.58)
I ' I I I
0 0.1 2 0.3 0.4 0.5 0.6 0.7 0.8 0.9 1
Zebra (0.19)
Crocodile (0.05)
30-40 40-50 50-60 60-70 70-80 80-90 b) Antelope c) Crocodile
b)40 c)6 d) 60 < X < 70
e) 2 f) 80 < X < 90 Check My Understanding (Pg 423)
g) People do not usually live to that age and thus since 1. a 1)50% 11)100% iii)25% iv) 12.5%
there are fewer people at that age, there is naturally
even fewer people at that age who attends Bingo
b)
games 0% 50%
12. a) 100%
I—I—I—I—I—I I I ' I ' l l I I I I
Ice
Sport Rugby Football Cricket Squash t t
Hockey
Pink Green Yellow Colour
Frequency 75 90 45 60 30
2. a) 0.1 b) 0.2 c) 0.4

b) Sports JL
17
1 Rugby
a) i) 0.833% ii) 10% iii) 16.7%
i Football b) The probability increases.
I Cricket
Check My Understanding (Pg 425)
Ice Hockey
a) Mutually exclusive
I Squash
b) Mutually exclusive
c) 25% c) Mutually exclusive
d) i) The bar chart d) i) Not mutually exclusive ii)Mutually exclusive
ii) It is easy to derive the difference of different data iii) Mutually exclusive iv) Not mutually exclusive
sets just by looking at the chart

Answers