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Natali5045456 [20]

2 years ago

11

Assume that the histograms below represent the amount of time it took two different groups of 100 people to run at a 5k race. As

sume that the mean of each histogram is the same. Which group has a greater mean absolute deviation. Why?

1 answer:

Effectus [21]2 years ago

6 0

I have know idea I would just guess if I were you

Explanation

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the marks in an examination for a Physics paper have normal distribution with mean μ and variance σ2 . 10% of the students obtai

Blababa [14]

Let $X$ be the random variable for the number of marks a given student receives on the exam.

10% of students obtain more than 75 marks, so

$P(X>75)=P\left(\dfrac{X-\mu}\sigma>\dfrac{75-\mu}\sigma\right)=P(Z>z_1)=0.10$

where $Z$ follows a standard normal distribution. The critical value for an upper-tail probability of 10% is

$P(Z>z_1)=1-F_Z(z_1)=0.10\implies z_1=F_Z^{-1}(0.90)$

where $F_Z(z)=P(Z\le z)$ denotes the CDF of $Z$ , and $F_Z^{-1}$ denotes the inverse CDF. We have

$z_1=F_Z^{-1}(0.90)\approx1.2816$

Similarly, because 20% of students obtain less than 40 marks, we have

$P(X$

so that

$P(Z$

Then $\mu,\sigma$ are such that

$\dfrac{75-\mu}\sigma\approx1.2816\implies75\approx\mu+1.2816\sigma$

$\dfrac{40-\mu}\sigma\approx-0.8416\implies40\approx\mu-0.8416\sigma$

and we find

$\mu\approx53.8739,\sigma\approx16.4848$

3 0

3 years ago

SELECT ALL of the Angles that are supplementary to Angle 7<br> **NO LINKS**

sergejj [24]

Answer:

The angles are 6,4,8and2 hope this helps

5 0

2 years ago

What is the decimal expansion of 11/40

Katena32 [7]

Answer:

0.275

Step-by-step explanation:

5 0

3 years ago

36% of what number is 18? SHOW YOUR WORK

Murljashka [212]

So 36% of x is 18
percent is parts out of 100
36%=36/100=0.36
'of' can be translated as muitiply
0.36 times x=18
divide both sdies by .36
x=50
the number is 50

8 0

3 years ago

Read 2 more answers

Aaliyah needed to get her computer fixed. She took it to the repair store. The technician at the store worked on the computer fo

Fofino [41]

Answer:

Equation: (441-66)divide by 3

91

Step-by-step explanation:

441-66=275

275/ 3=91.6666 repeat

8 0

2 years ago