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Agata [3.3K]
3 years ago
5

I NEED HELP WITH (33) B,C,D

Mathematics
1 answer:
Anna35 [415]3 years ago
7 0

Answer:

what are the answer choices?

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Suppose that the rate of return on stocks is normally dis-tributed with mean of 9% and a standard deviation of 3%. If I pick fiv
alisha [4.7K]

Answer:

The probability that at least two stocks will have a return of more than 12% is 0.1810.

Step-by-step explanation:

Let <em>X</em> = rate of return on stocks.

The random variable <em>X</em> follows a Normal distribution, N (9, 3²).

Compute the probability that a stock has rate of return more than 12% as follows:

P(X\geq 12)=1-P(X

**Use the <em>z</em> table for the probability.

The probability of a stock having rate of return more than 12% is 0.1587.

Now define a random variable <em>Y</em> as the number of stocks that has rate of return more than 12%.

The sample size of stocks selected is, <em>n</em> = 5.

The random variable <em>Y </em>follows a Binomial distribution.

The probability of a Binomial distribution is:

P(X=x)={n\choose x}p^{x}(1-p)^{n-x};\ x=0, 1, 2, ...

Compute the value of P (X ≥ 2) as follows:

P (X ≥ 2) = 1 - P (X < 2)

              = 1 - P (X = 0) - P (X = 1)

              =1-{5\choose 0}(0.1587)^{0}(1-0.1587)^{5-0}-{5\choose 1}(0.1587)^{1}(1-0.1587)^{5-1}\\=1-0.4215-0.3975\\=0.1810

Thus, the probability that at least two stocks will have a return of more than 12% is 0.1810.

6 0
3 years ago
Kristen has been earning $150 per week by babysitting. She has been working hard to save 20% of each week's earnings. If she con
anyanavicka [17]

Answer:

it will take her 6 weeks

Step-by-step explanation:

150*.2=30

180/30=6

5 0
3 years ago
Please help will give brainliest. Links will be banned
AlexFokin [52]

Answer:

I believe it is C.

6 0
3 years ago
Which is an equivalent expression for four sevenths squared times two thirds raised to the power of negative three all raised to
Ket [755]

Seven-fourths squared times two-thirds cubed the expression is (7/4)² x (2/3)³. The correct option is B.

<h3>What is an expression?</h3>

Expression in maths is defined as the collection of the numbers variables and functions by using signs like addition, subtraction, multiplication, and division.


Numbers (constants), variables, operations, functions, brackets, punctuation, and grouping can all be represented by mathematical symbols, which can also be used to indicate the logical syntax's order of operations and other features.

The given expression will be solved as below:-

[ ( 4 / 7)² x ( 2 / 3)⁻³ ]⁻¹ =  ( 4 / 7)⁻² x  (2 / 3)³

[ ( 4 / 7)² x ( 2 / 3)⁻³ ]⁻¹ = ( 7 / 4)² x  (2 / 3)³

Therefore, seven-fourths squared times two-thirds cubed the expression is (7/4)² x (2/3)³. The correct option is B.

To know more about expression follow

brainly.com/question/12592609

#SPJ1

6 0
1 year ago
Please help me answer and explain number 55
melamori03 [73]

Answer:

D

Step-by-step explanation:

An operation of two real numbers is defined by the rule

a\bigotimes b=b^a+2ab

Calculate 2\bigotimes (1\bigotimes 3). First evaluate the expression in brackets:

1\bigotimes 3=1^3+2\cdot 1\cdot 3=1+6=7

Now,

2\bigotimes (1\bigotimes 3)=2\bigotimes 7=2^7+2\cdot 2\cdot 7=128+28=156

6 0
3 years ago
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