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3 years ago

Helllp me plzzzzzzzz i will mark brainlist

Mathematics

2 answers:

EastWind [94]3 years ago

8 0

126 is the answer if you add all the birds together you get 140 then divide it by the number of blue jays and you roughly get 2.4 so you divide 300 by 2.4 and you’ll get a number close to 126 (125) just me doing the math roughly but yeah the answer is definitely 126

katen-ka-za [31]3 years ago

7 0

Answer:

126

Step-by-step explanation:

set up a proportion, 59/140= x/300. Cross multiply: 140x= 17700. Then divide both sides by 140. the answer is 126.42857... ore rounded, 126.

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An educator claims that the average salary of substitute teachers in school districts is less than $60 per day. A random sample

valentina_108 [34]

Answer:

$t=\frac{58.875-60}{\frac{5.083}{\sqrt{8}}}=-0.626$

The degrees of freedom are given by:

$df=n-1=8-1=7$

The p value would be given by:

$p_v =P(t_{(7)}$

Since the p value is higher than 0.1 we have enough evidence to FAIl to reject the null hypothesis and we can't conclude that the true mean is less than 60

Step-by-step explanation:

Information given

60, 56, 60, 55, 70, 55, 60, and 55.

We can calculate the mean and deviation with these formulas:

$\bar X= \frac{\sum_{i=1}^n X_i}{n}$

$s=\sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}$

Replacing we got:

$\bar X=58.875$ represent the mean

$s=5.083$ represent the sample standard deviation for the sample

$n=8$ sample size

$\mu_o =60$ represent the value that we want to test

$\alpha=0.1$ represent the significance level

t would represent the statistic

$p_v$ represent the p value

Hypothesis to test

We want to test if the true mean is less than 60, the system of hypothesis would be:

Null hypothesis: $\mu \geq 60$

Alternative hypothesis: $\mu < 60$

The statistic would be given by:

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

Replacing the info we got:

$t=\frac{58.875-60}{\frac{5.083}{\sqrt{8}}}=-0.626$

The degrees of freedom are given by:

$df=n-1=8-1=7$

The p value would be given by:

$p_v =P(t_{(7)}$

Since the p value is higher than 0.1 we have enough evidence to FAIl to reject the null hypothesis and we can't conclude that the true mean is less than 60

3 0

3 years ago

Walking path across the park is represented by the equation Y equals negative 2X -7. A new path will be built perpendicular to t

Genrish500 [490]

here the equation of path is -2x-7=y

let us find slope of this line by using y=mx+b

so slope m=-2

now new path is perpendicular to this path.

product of slopes of perpendiculars is -1

so slope of new path is 1/2

now it passes through (-2,-3) with slope 1/2

using y=mx+b to get value of b

-3=1/2(-2) +b

b=-2

plugging m=-1/2 and b=-2 in y=mx + b to get the final equation as

y=(-1/2) x -2 is the equation of new path

5 0

3 years ago

Please help me with this 10 points

kiruha [24]

Answer:

i couldnt see the first 2 good.

3. exact form= 58/15 decimal form= 3.86 mixed # form= 3 13/15

4. exact form= 13/8 decimal form = 1.625 mixed numbers 1 5/8

5.convert thw mixed number to improper fractions, then find the LCD and combine...-8

4 0

3 years ago

What is 2 1/3*5????????

Mariana [72]

The answer is 11.66 or 11.67 depending on how you round the decimal

3 0

3 years ago

Help ASAP:Solve : 0.84+91.279

jeka94

Answer:

92.119

Step-by-step explanation:

0.84+91.279=92.119

Hope this helps!

6 0

3 years ago

Read 2 more answers