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kupik [55]
4 years ago
8

there are 13 boys and 10 girls in a class. work out the total number of ways that 1 boy and 1 girl can be chosen from the class​

Mathematics
1 answer:
LuckyWell [14K]4 years ago
4 0

Answer:

130 ways  

Step-by-step explanation:

13*10 = 130

130 ways

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Jessie is 6 years older than Todd, and Todd is 2 years younger than Ryan. If Ryan is r years old, which expression shows how old
mariarad [96]
Jessie = Todd + 6
Todd = Ryan -2

if Ryan = r
so Todd = r-2
then Jessie = (r-2) + 6 = r-4 years old
6 0
4 years ago
(1 point) A recent report for a regional airline reported that the mean number of hours of flying time for its pilots is 56 hour
Ray Of Light [21]

Answer:

(53.812 ; 58.188) ; 156

Step-by-step explanation:

Given that :

Sample size (n) = 51

Mean (m) = 56

Standard deviation (σ) = 9.5

α = 90%

Using the relation :

Confidence interval = mean ± Error

Error = Zcritical * (standard deviation / sqrt (n))

Zcritical at 90% = 1.645

Error = 1.645 * (9.5 / sqrt(51))

Error = 1.645 * 1.3302660

Error = 2.1882877

Hence,

Confidence interval :

Lower boundary = 56 - 2.1882877 = 53.8117123

Upper boundary = 56 + 2.1882877 = 58.1882877

Confidence interval = (53.812 ; 58.188)

2.)

Margin of Error (ME) = 1.25

α = 90%

Sample size = ((Zcritical * σ) / ME)^2

Zcritical at 90% = 1.645

Sample size = ((1.645 * 9.5) / 1.25)^2

Sample size = (15.6275 / 1.25)^2

Sample size = 12.502^2 = 156.3000

Sample size = 156

3 0
3 years ago
What is the value of x in the solution to the system of linear equations? {y=3x+2 y=x-4 a –7 b –3 c 1 d 5
lyudmila [28]

Since y must equal both 3x+2 and x-4, we deduce that 3x+2 and x-4 must equal each other. So, we have

3x+2=x-4 \iff 2x+2=-4 \iff 2x=-6 \iff x=-3

5 0
3 years ago
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Please help!!! Will give brainliest
AlladinOne [14]

Answer:

option C

Step-by-step explanation:

option C is the correct answer of this question.

<em>plz </em><em>mark</em><em> my</em><em> answer</em><em> as</em><em> brainlist</em><em> plzzzz</em><em> vote</em><em> me</em><em>.</em>

<em>hope</em><em> this</em><em> will</em><em> be</em><em> helpful</em><em> to</em><em> you</em><em>.</em>

5 0
3 years ago
There are 45 boys and 60 girls in Year 6. What is the ratio of boys to girls? Write the ratio in the simplest form
exis [7]
The answer to this is 3:4
6 0
4 years ago
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