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3 years ago

Suppose that you flip a coin 13 times. What is the probability that you achieve at least 5 tails?

1 answer:

5 0

Heads, or tails. It's 1/2 a chance, because either way you will either land heads or tails. It would be a probability of 1-(1/2)^5. Can you solve that?

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in one month darius spends 10 hours walking dogs. How many dogs walks does he do in one month ALSO this is dividing a whole numb

MA_775_DIABLO [31]

Step-by-step explanation:

let's assume one month is 30 days you would multiply 10 by 30.

$10 \times 30 = 300$

which would be 300 hours in 1 month

now if one month is 31 days you would simply multiply 10 by 31.

$10 \times 31 = 310$

which would be 310 hours

6 0

2 years ago

How do you subtract this

Maurinko [17]

To subtract fractions, you need to obtain a common denominator. We can achieve this, in this case, by multiplying:

$(\frac{4}{4} * \frac{22}{13}) - (\frac{13}{13}*\frac{21}{4})$

Simplify this:

$\frac{88}{52} - \frac{286}{52}$

Now we have common denominators, so we can easily just subtract the numerators, and we have the answer:

$-\frac{198}{52}$

Notice that this is divisible by 2:

$-\frac{99}{26}$

That's your answer!

8 0

2 years ago

For each of the following functions, (i) find the constant c so that f(x) is a pdf of a random variable X, (ii) find the cdf, F(

mel-nik [20]

Answer:

(a)

c=1/2

cdf is $F(x) = x^2$

Step-by-step explanation:

Remember that if $f$ is the pdf of a random variable X .

$\int\limits_{-\infty}^{\infty} f(x) \,dx = 1$

Then,

(a)

$\int\limits_{-\infty}^{\infty} 4xc \,dx = \int\limits_{0}^{1} 4xc \, d x = 2c = 1$

Therefore

c=1/2

and

$f(x)=2x$

then to compute the cdf, we have

$F(x) = P(X \leq x) = \int\limits_{-\infty}^{x} 2y \,dy = \int\limits_{0}^{x} 2y \, dy = x^2$

7 0

2 years ago

Payton goes shopping. She finds two shirts. One costs $24.97 and the other costs $13.75. She needs to know if she has enough mon

LUCKY_DIMON [66]

Answer:Explained

Step-by-step explanation:

Given

One shirt cost $24.97 and other costs $13.75

Using mental math, Payton rounds $24.97 to $25

and add it to $13.75 to get $38.75

in order to get correct total of two shirts Payton needs to subtract $0.03 from the final amount as she round 0.97 to 1 initially

so final amount will be 38.75-0.03=$38.72

3 0

3 years ago

At a birthday party, the magician gave away 7 red balloons, 14 white balloons and 9 blue balloons. What is the percent of the ba

Svetach [21]

Answer:

30%

Step-by-step explanation:

7+14+9=30

10% of 30 is 3.

3 goes into nine 3 times so you times 10% by 3 to get 30%.

6 0

2 years ago

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