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Galina-37 [17]
3 years ago
12

Can anyone help me with this question

Mathematics
1 answer:
Degger [83]3 years ago
8 0

Answer:

D maybe, i aint sure but seems right

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Most everyday purchases at the store are labeled with the price of the item before sales tax. Which expression could be used to
lord [1]

Original cost -total cost to get amount of tax.

4 0
3 years ago
A research team at Cornell University conducted a study showing that approximately 10% of all businessmen who wear ties wear the
LenKa [72]

Answer:

a) The probability that at least 5 ties are too tight is P=0.0432.

b) The probability that at most 12 ties are too tight is P=1.

Step-by-step explanation:

In this problem, we could represent the proabilities of this events with the Binomial distirbution, with parameter p=0.1 and sample size n=20.

a) We can express the probability that at least 5 ties are too tight as:

P(x\geq5)=1-\sum\limits^4_{k=0} {\frac{n!}{k!(n-k)!} p^k(1-p)^{n-k}}\\\\P(x\geq5)=1-(0.1216+0.2702+0.2852+0.1901+0.0898)\\\\P(x\geq5)=1-0.9568=0.0432

The probability that at least 5 ties are too tight is P=0.0432.

a) We can express the probability that at most 12 ties are too tight as:

P(x\leq 12)=\sum\limits^{12}_{k=0} {\frac{n!}{k!(n-k)!} p^k(1-p)^{n-k}}\\\\P(x\leq 12)=0.1216+0.2702+0.2852+0.1901+0.0898+0.0319+0.0089+0.0020+0.0004+0.0001+0.0000+0.0000+0.0000\\\\P(x\leq 12)=1

The probability that at most 12 ties are too tight is P=1.

5 0
3 years ago
Dependent events can best be described as
dem82 [27]

Answer:

Sonya watched

1

3

of a movie in the morning, and she watched some more at night. By the end of the day, she still had

1

4

of the movie left to watch. How much of the movie did Sonya watch at night?

Step-by-step explanation:

SORRY WRONG

8 0
3 years ago
Read 2 more answers
F(x) = x2 + 1<br> What is f(f(x))?<br> O x + 2x²+1<br> O x + 2x²+2<br> x + 2<br> x+1
nadya68 [22]

Answer:

It's x^4+2x^2+2

Step-by-step explanation:

The argument of f(f(x)) function becomes x^2+1-> F=(x^2+1)^2+1 Opening the brackets you get my answer. Not sure if O sign stood for ^4.

5 0
4 years ago
What is a 20% tip, if the dinner bill is 123.43? Show your<br> work.
Harrizon [31]

Answer:

24.686

Step-by-step explanation:

20% is 1/5 so you divide by five. 123.43/5 = 24.686

24.686

x        5

----------

       30

     400

   3000

 20000

100000

123430

add decimal

123.430

= 123.43

5 0
3 years ago
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