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4 years ago

If you flip a fair coin 7 times, what is the probability that you will get exactly 2 tails?

Mathematics

1 answer:

blsea [12.9K]4 years ago

4 0

it would be 3.5 or a little less than 50%

Step-by-step explanation:

You might be interested in

For what values of x is x2-36=5x true? 0 -9 and 4 -4 and 9 4 and -9 9 and 4

sveticcg [70]

Answer:

-4 and 9

Step-by-step explanation:

x2-36=5x'

x*x - 5x - 36 = 0

(x - 9) (x + 4) = 0

roots 9 and -4

8 0

3 years ago

. Paris is saving to take the SAT prep course that costs $350. So far, she has saved $180, and she

Korolek [52]

Answer:

10 weeks

Step-by-step explanation:

Use the equation 180+17w=350

3 0

3 years ago

The population of Adamsville grew from 6000 to 13000 in 7 years. Assuming uninhibited exponential growth, what is the expected p

IgorLugansk [536]

Answer:

18107.32

Step-by-step explanation:

Set up the exponential function in the form:

$P = P_0(R)^t$

so P is the new population, $P_0$ is the original population, R is the rate of increase in population, and t is the time in years.

You have to use the information given to find the rate that the population is increasing and then use that rate to find the new population after more time passes.

$13000 = 6000(R)^7\\\\\\frac{13000}{6000} = R^7\\\\\sqrt[7]{\frac{13000}{6000} } = R\\\\\\ R = 1.116786872$

Now that you found the rate, you can use the function to find the population after another 3 years.

$P = 13000(1.116786872)^3\\P = 18107.32317\\$

So the population is 18107, rounded to the nearest whole number.

4 0

4 years ago

twinlakes on the shelf of a covenience store lose their fresh tastines over time. we say that the taste quality is 1 when the tw

Zolol [24]

Answer:

The graph is shown below.

The time to make the taste to half is 4.265 s.

Step-by-step explanation:

Given:

Initial value of the taste is, $Q_0=1$

Therefore, the quality of taste over time 't' is given as:

$Q(t)=Q_0(0.85)^t\\Q(t)=1(0.85)^t$

Now, when the taste reduces to half, $Q=0.5$

Therefore,

$0.5=1(0.85)^t$

Taking natural log on both the sides, we get:

$\ln(0.5)=\ln(0.85)^t\\\ln(0.5)=t\ln(0.85)\\t=\frac{ln(0.5)}{\ln(0.85)}=4.265\ s$

Therefore, the time to make the taste to half is 4.265 s.

4 0

3 years ago

A man goes into a store and says, “If you give me as much money as I have with me now, I will spend $10 in your store.” The stor

FromTheMoon [43]

Answer:

$8.75

Step-by-step explanation:

Let x = the amount the man originally had

The man has $x and says "if you give me $x, I will spend $10."

y = amount he has after 1st proposition = x + x - 10 = 2x - 10

He repeats this procedure, now with $2x-10 in his pocket...

z = amount he has after 2nd proposition = (2x - 10) + (2x - 10) - 10 = 4x - 30

He repeats this procedure, now with $4x-30 in his pocket...but this time he is left with zero dollars...

r = amount he has after 3rd proposition = (4x-30) + (4x-30) - 10 = 8x-70 = 0

8x - 70 = 0,

x = $8.75

6 0

3 years ago