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2 years ago

Need help will give brainlest!!

Mathematics

2 answers:

Evgesh-ka [11]2 years ago

5 0

Answer:

14/20

Step-by-step explanation:

Pepsi [2]2 years ago

3 0

Answer
Solving first no.1(3/4)
=7/4 divided by 2/5
= as per rule 7/4*5/2
=35/8
=Dividing 35 by 8
= answer is d) part
= 4*3/8
Hope it helps

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Suppose that the length of a phone call in minutes is an exponential random variable with parameter λ = 1/ 8. If someone arrives

Elis [28]

Answer:

a) P=0.535

b) P=0.204

c) P=0.286

Step-by-step explanation:

The exponential distribution is expressed as

$F(x>t)=e^{-\lambda t}$

In this example, λ=1/8=0.125 min⁻¹.

a) The probability of having to wait more than 5 minutes

$F(x>5)=e^{-0.125*5}=e^{-0.625}=0.535$

b) The probability of having to wait between 10 and 20 minutes

$F(1020)=e^{-0.125*10}-e^{-0.125*20}\\\\F(10$

c) The exponential distribution is memory-less, so it is independent of past events.

If you have waited 5 minutes, the probability of waiting more than 15 minutes in total is the same as the probability of waiting 15-5=10 minutes.

$F(x>15|t^*=5)=F(x>15)/F(x>5)=\frac{e^{-0.125*15}}{e^{-0.125*5}}=e^{-0.125*(15-5)}\\\\ F(x>15|t^*=5)=e^{-0.125*(10)}=F(x>10)=0.286$

5 0

3 years ago

Angad rolls a fair dice 120 times. How many times would Angad expect to roll an even number?

Luda [366]

Answer:

60 times

Step-by-step explanation:

Since each roll has a 50% chance of rolling an even number

50% of 120 is 60

4 0

3 years ago

Solve for x (Angle relationship in Circles)

makkiz [27]

Step-by-step explanation:

$180 \degree - 102 \degree = \frac{1}{2} (x + 95\degree) \\ \\ \therefore \: 72 \degree = \frac{1}{2} (x + 95\degree) \\ \\ \therefore \: 72 \degree \times 2= (x + 95\degree) \\ \\ \therefore \: 144 \degree = x + 95\degree \\ \\ \therefore \:x = 144 \degree - 95\degree \\ \\ \huge \red{ \boxed{\therefore \:x = 49\degree}}$

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3 years ago

Which equation shows y = -1/2x + 4 is in standard form?

Scrat [10]

For this case we have that by definition, the standard way to write the equation of a line, is given by:

$ax + by = c$

Where a, b and c are integers.

Given $y =-\frac{1}{2}x+ 4$

We can write it in the standard way:

$\frac{1}{2}x+ y = 4$

$a=\frac{1}{2}$ and by the previous definition, the numbers a, b and c must be integers.

Thus, we multiply the equation by 2, on both sides so as not to alter the equality.

$2*\frac{1}{2}x+ 2 * y= 2 * 4$

$x + 2y = 8$

Thus, the equation of $y =-\frac{1}{2}x+ 4$ , in its standard form is given by:

$x + 2y = 8$

Answer:

Option B

4 0

3 years ago

Read 2 more answers

Help pls ????????!!!!!!

7nadin3 [17]

Answer:

let the number of steps taken by friend 1, 2 and 3 be: x, y and z respectively

we know that the mean of the total steps taken by all the friends is 10,350

Since the formula for mean is: sum of all values / number of values

here, the total values is the total number of steps taken

So,

steps taken by friend 1 +steps taken by friend 2 +steps taken by friend 3 +steps taken by friend 4 +steps taken by friend 5 +steps taken by friend 6

all that divided by 6 will give us the mean

so, 7800 + 8000 + 9800 + x + y + z / 6

(25600 + x + y + z)/6 = 10350

25600 + x + y + z = 10350 * 6

x + y + z = 62100 - 25600

x + y + z = 36500

So since the sum of x, y and z is 36500,

we can say that the average value of x , y and z is 12167 (36500/3)

So the next thing to make an equation out of is Median

to find the median, we need to arrange the values in any order you like, i will arrange in descending order

so since the estimated value of all x , y and z is greater than the greatest known value:

x > y > z > 9800 > 8000 > 7800

Since this set of values has an even number of values, we will take the average of the middle 2 values as the median

(9800 + z)/2 = 10000

9800 + z = 20000

z = 10200 -------- we have found one of the three values! getting closer

Now, the final equation will be found from the range

since we already have sorted our data, and the difference of the highest and lowest is the range

x > y > z > 9800 > 8000 > 7800

So, x - 7800 = 7500

x = 15300 ------- now that we have x and z, we can use the first equation to find the value of y and we will be done!

x + y + z = 36500

replacing the values

15300 + y + 10200 = 62100

y = 36500 - 25500

y = 11000

So the three remaining friends walked

15300, 11000 and 10200 steps

6 0

3 years ago