Mathematics, 01.07.2020 21:01 eemorales5100

The number of pets 40 students own is recorded Number of pets: 2 , 4, 6, 8, 10
Number of students: x, 2, y, 6, 14

a) (i) show that x+y=18
(ii) If the mean of the distribution is 6.4, show that x +3y =30
(iii) Hence, find the value of x and of y
b) Using your answers in (a) (iii), find
(i) the median,
(ii) the mode,
Of the distribution

Answers: 2

Show answers

Answers

Answer from: taysomoneyyy

i) & ii) -> See Explanation Below

iii) y = 6 and x = 12

i) Median = 7

ii) Mode = 10

Step-by-step explanation:

Given

Number of pets: 2 , 4, 6, 8, 10

Number of students: x, 2, y, 6, 14

Total students = 40

Required

a) (i) show that x+y=18

Given that total number of students is 40;

This implies that

x + 2 + y + 6 + 14 = 40

Collect like terms

x + y = 40 - 14 - 6 - 2

x + y = 18

a) (ii) If the mean of the distribution is 6.4, show that x +3y =30

The mean of a distribution is calculated as thus

$Mean = \frac{\sum fx}{\sum x}$

$\sum fx}$ is gotten by multiplying number of pets by corresponding number of students

$\sum fx} = 2 * x + 4 * 2 + 6 * y + 8 * 6 + 10 * 14$

$\sum fx} = 2 x + 8 + 6y + 48 + 140$

$\sum fx} = 2 x + 6y + 48 + 140+ 8$

$\sum fx} = 2 x + 6y + 196$

$\sum x}$ is the total number of students

$\sum x} = 40$

So;

$Mean = \frac{\sum fx}{\sum x}$ becomes

$Mean = \frac{2 x + 6y + 196}{40}$

Substitute 6.4 for Mean

$6.4 = \frac{2 x + 6y + 196}{40}$

Multiply both sides by 40

256 = 2 x + 6y + 196

Subtract 196 from both sides

256 -196= 2 x + 6y + 196-196

60= 2 x + 6y

Divide both sides by 2

$\frac{60}{2}= \frac{2 x}{2} + \frac{6y}{2}$

$30 = \frac{2 x}{2} + \frac{6y}{2}$

30 = x + 3y

Reorder

x + 3y = 30

a) (iii) Hence, find the value of x and of y

Using

x + y = 18 and

x + 3y = 30

Subtract both equations

(x + y = 18) - (x + 3y = 30)

x - x + y - 3y = 18 - 30

y - 3y = 18 - 30

-2y = -12

Divide both sides by -2

$\frac{-2y}{-2} = \frac{-12}{-2}$

$y = \frac{-12}{-2}$

y = 6

Substitute 6 for y in x + y = 18

x + y = 18 becomes

x + 6 = 18

Subtract 6 from both sides

x + 6 - 6 = 18 - 6

x = 12

i) Calculate the Median

First, we need to tabulate the given data properly

Number of Pets ------ Number of students ------- Cumulative Frequency

2 ------------------------------12 -----------------------------------12

4 ------------------------------2 -----------------------------------14

6 ------------------------------6 -----------------------------------20

8 ------------------------------6 -----------------------------------26

10 ------------------------------14 -----------------------------------40

Since the number of pets is already arranged in ascending order,

the next step is to calculate the median element

Number of students = 40

$Median = \frac{40}{2}$

Median = 20

Given that number of students (40) is an even number,

The median is the average of the 20th and 21st element

From the table above; the median can be gotten from

6 ------------------------------6 -----------------------------------20

8 ------------------------------6 -----------------------------------26

The 20th element = 6

The 21st element = 8

$Median = \frac{6 + 8}{2}$

$Median = \frac{14}{2}$

Median = 7

ii) Mode

The mode is the corresponding data with the highest frequency

The highest frequency is 14;

The number of pets with frequency of 14 is 10

Hence,

Mode = 10

Answer from: Quest

450

step-by-step explanation:

you get texts and minutes, so why not

Answer from: Quest

answer:

payment just for service

→

87.12

payment for service including tax

→

94.09

explanation:

service only with 20% tip

→

72.6

(

100

)

87.12

in the opening of the question the word 'service' is associated only with the pretax value.

the closing part of the question asks: how much did she pay for the

service

−−−−−−

so technically the answer is

→

72.6

(

100

)

87.12

however, the intention of the question provider may have been that your answer is to be

87.12

(

100

)

94.09

to 2 decimal places.

payment just for service

→

87.12

payment for service including tax

→

94.09

tony b

mar 21, 2017

answer:

trying to explain it another way

explanation:

service charge

→

72.60

20% tip

100

72.60

14.52

−−−−−−

←

add

87.12

tax

100

87.12

6.97

−−−−−

←

add

94.09

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The number of pets 40 students own is recorded Number of pets: 2 , 4, 6, 8, 10
Number of stud...