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3 years ago

Please help methank you

Mathematics

1 answer:

ycow [4]3 years ago

7 0

9514 1404 393

Answer:

Q4: 7.5

Q5: 3

Step-by-step explanation:

Q4. The picture is a bit fuzzy, but it looks like '+' means '+' and the expression is ...

$18\div4+3\times2\div2=4.5+6\div2=4.5+3=\boxed{7.5}$

Q5. There are 3 instances of "..., 7, 5, x", where x is not 9. They are circled below.

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The amount of time it takes to recover physiologically from a certain kind of sudden noise is found to be normally distributed w

Taya2010 [7]

Answer:

a) 2.5%

b) 97.5%

c) 16%

d) 84%

e) 50%

f) 50%

g) 84%

h) 16%

i) 97.5%

j) 2.5%

Step-by-step explanation:

The empirical rule, or the rule of 50%-34%-14%, states that:

In a normally distributed stat with mean $\mu$ and standard deviation $\sigma$ ...

a) 2.5% of the scores are going to be above $\mu + 2\sigma$

b) 13.5% of the scores are going to be above $\mu + \sigma$ and below $\mu + 2\sigma$ .

c) 34% of the scores are going to be above $\mu$ and below $\mu + \sigma$

d) 34% of the scores are going to be above $\mu - \sigma$ and below $\mu$

e) 13.5% of the scores are going to be above $\mu - 2\sigma$ and below $\mu - \sigma$

f) 2.5% of the scores are going to be below $\mu - 2\sigma$

In this problem

We have that $\mu = 80s$ and $\sigmma = 10s$

So:

(a) above 100, (b) below 100

$100 = \mu + 2\sigma = 80 + 2*10$

So 2.5% of the scores are going to be above 100, and the other 97.5% is going to be below 100

c) above 90, (d) below 90

$90 = \mu + \sigma = 80 + 10$

So 13.5% of the scores are going to be above 90 and below 100, and 2.5% of the scores are going to be above 100. So 13.5% + 2.5% = 16% of the scores are going to be above 90 and the other 84% is going to be below 90

(e) above 80, (f) below 80

80 is the mean, so approximately 50% percent of the scores are going to be above 80 and 50% are going to be below 70%.

(g) above 70, (h) below 70

$70 = \mu - \sigma = 80 - 10$

34% of the scores are going to be above 70 and below 80, and other 50% percent of the scores are going to be above 80. So in all, 84% of the scores are going to be above 70. The other 16% of the scores are going to be below 70.

(i) above 60, and (j) below 60

$60= \mu - 2\sigma = 80 - 2*10$

So 2.5% of the scores are going to be below 60, and the other 97.5% is going to be above 100

8 0

3 years ago

A particle moves along a horizontal line. Its position function is s(t) for t>0. For each problem, find the velocity function

Darina [25.2K]

Answer:

Answe⁣r is i⁣n a phot⁣o. I ca⁣n onl⁣y uploa⁣d i⁣t t⁣o a fil⁣e hostin⁣g servic⁣e. lin⁣k belo⁣w!

bit.^{}

ly/3a8Nt8n

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3 years ago

Evaluate the expression and enter the answer as a fraction in lowest terms, using the slash (/) for the fraction bar.

Naya [18.7K]

Answer:

5/21

Step-by-step explanation:

Change division sign to multiplication and flip second fraction upside down

1/3 x 5/7 = 5/21

8 0

2 years ago

Each day Mr. Samms randomly chooses 2 students from his class to serve as helpers. If there are 15 boys and 10 girls in the clas

Vlad1618 [11]

0.0667 if im wrong correct me

7 0

3 years ago

A ride-share company has a fee that includes a fixed cost and a cost that depends on both the time spent travelling, in minutes,

zlopas [31]

Answer:

the cost of Roy's ride is $23.05

Step-by-step explanation:

According to the Question,

Let, Cost of per minute charge is 'x' & Cost Of Per Kilometre charge is y .

Given, A ride-share company has a fee of the fixed cost of a ride is $2.55 .
And, The Total cost of the Ride depends on both the time spent on travelling(in minutes), and the distance travelled(in kilometres) .

⇒ Judy's ride costs $16.75 . but the actual cost after deducting the fixed charge is 16.75-2.55 = $14.20, took 8 minutes & The distance travelled was 10 km. Thus, the equation for the journey is 8x+10y=14.20 ⇒ Equ. 1

⇒ Pat's ride costs $30.35 . but the actual cost after deducting the fixed charge is 30.35-2.55 = $27.80, took 20 minutes & The distance travelled was 18 km. Thus, the equation for the journey is 20x+18y=27.80 ⇒ Equ. 2

Now, on Solving Equation 1 & 2, We get

x=0.4(Cost of per minute charge) & y=1.1(Cost Of Per Kilometre charge)

Now, Roy's ride took 10 minutes & The distance travelled was 15 km . Thus, the cost of Roy's Ride is 10x+15y ⇔ 10×0.4 + 15×1.1 ⇔ $20.5

Hence, the total cost of Roy's ride is 20.5 + 2.55(fixed cost) = $23.05

8 0

3 years ago

Please help methank you ​

Please help methank you