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Bumek [7]
2 years ago
13

11. There are 600 students in a school. If 20% students are girls, find the number of girls.​

Mathematics
2 answers:
kolbaska11 [484]2 years ago
5 0

Answer:

120

Step-by-step explanation:

20% of 600

= 120 girls

sergeinik [125]2 years ago
4 0

Explanation

Total no. of students = 600%

20% of the total are girls

No. of girls = 20% of 600

  • 20/100 × 600

  • ⅕ × 600

  • 120

No. of girls is 120

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Solve kx + 7 = 4 for x.
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Answer:

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Step-by-step explanation:

<u>Trapezoid</u>

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Answer:

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E. -0.723

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Since the p value is very high we don't have enough evidence to conclude that the true mean for the lengths is different from 6 cm.

Step-by-step explanation:

Information provided

\bar X=5.97 represent the sample mean for the length

s=0.4 represent the sample standard deviation

n=93 sample size  

\mu_o =6 represent the value that we want to test

\alpha=0.05 represent the significance level

t would represent the statistic  

p_v represent the p value for the test

System of hypothesis

We need to conduct a hypothesis in order to check if the lathe is in perfect adjustment (6cm), then the system of hypothesis would be:  

Null hypothesis:\mu = 6  

Alternative hypothesis:\mu \neq 6  

since we don't know the population deviation the statistic is:

t=\frac{\bar X-\mu_o}{\frac{s}{\sqrt{n}}}  (1)  

Replacing in formula (1) we got:

t=\frac{5.97-6}{\frac{0.4}{\sqrt{93}}}=-0.723    

E. -0.723

P value

The degrees of freedom are given by:

df=n-1=93-1=92  

Since is a two tailed test the p value would be:  

p_v =2*P(t_{(92)}  

Since the p value is very high we don't have enough evidence to conclude that the true mean for the lengths is different from 6 cm.

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3 years ago
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