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3 years ago

Need help fast, being timed!!

Mathematics

1 answer:

tamaranim1 [39]3 years ago

4 0

Answer:

Mr. Roland’s class was more successful because his class’s lower quartile was the same as Mrs. Cai’s class’s upper quartile.

Step-by-step explanation:

From given scatter plot, we see that upper quartile of Mrs. Cai's class = 4

lower quartile of Mr. Roland’s class = 4

Both are equal so that means.

That means Mr. Roland’s class was more successful because his class’s lower quartile was the same as Mrs. Cai’s class’s upper quartile.

Hence last choice is correct.

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12A+14+2B+6-3C+2A-3B+1=

iris [78.8K]

Answer: 14a - b - 3c + 21

7 0

3 years ago

Read 2 more answers

The average systolic blood pressure was found to be 140 mm for people who have high responsibility jobs, specifically investment

defon

Answer:

t = -1.428

Step-by-step explanation:

Average blood pressure among people with high responsibility jobs = u = 140 mm

Number of people sampled for the study = n = 51

Average blood pressure of the sample = x = 139 mm

Standard deviation of the sample = s = 5 mm

The claim is that practicing yoga decreases the blood pressure. So we have to test that after practicing yoga, the average blood pressure will be lesser than 140. Based on this we can formulate the null and alternate hypothesis as:

Null Hypothesis: $\mu \geq 140$

Alternate Hypothesis: $\mu < 140$

Since population standard deviation is not known, we cannot use z-distribution for this test. We are given the value of sample standard deviation, so t-test will be used for this case.

Test statistic is calculated as:

$t=\frac{x-u}{\frac{s}{\sqrt{n} } }$

Using the values in this formula gives us:

$t=\frac{139-140}{\frac{5}{\sqrt{51}}}\\\\ t=-1.428$

Therefore, the value of test statistic is -1.428

4 0

3 years ago

The triangle below is being reduced by a scale factor of two-thirds. What is the base of the new drawing? 15 m

DanielleElmas [232]

Answer:

Step-by-step explanation:

A scale factor of 2/3 means multiplying all side lengths by 2/3

15*2/3=10

8 0

2 years ago

Helpppppppppppp plss with this problem

3241004551 [841]

Given :7872 ÷ 305.

Because it's estimation. So, we need to estimate the number 7872 to 8000.

In order to divide 8000 by a number we need to estimate 305 to the 400. Because 400 is exact divisor of 8000.

If we divide 8000 by 400 we get 20.

And it's obviously less then 60000 ÷ 300= = 200.

20 < 200.

<h3>Therefore, Harrison is absolutely correct.</h3>

6 0

4 years ago

I need help plz and thank u sm

Alchen [17]

Answer:

5x + 3

Step-by-step explanation:

Since we can see DC is the median of Triangle ABC

So it breaks the into two equal parts

Given

AD = 2x + 5

BD = 3x - 2

Now

AB = AB + BD

= 2x + 5 + 3x - 2

= 5x + 3

Hope it will help :)❤

7 0

3 years ago