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3 years ago

Please help me on this question?

Mathematics

2 answers:

seropon [69]3 years ago

4 0

If this is a word expression, then this is probably correct but idk what a word expression is so here goes.

15 plus twenty times four

NeTakaya3 years ago

3 0

Four times fifteen plus twenty in parentheses
idk if its correct though <span />

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Find the volume of a sphere having a radius of 9/8mi

Tamiku [17]

$\pi$ Answer:

the volume is 5.96

Step-by-step explanation:

$v =\frac{4}{3} \pi r^3\\\\$

9/8 as a decimal is 1.13

$\frac{4}{3}$ × $\pi$ ×1.13³≈5.96412

Hope this helps:).......if not then sorry for wasting your time and may God bless you:)

3 0

2 years ago

You play two games against the same opponent. The probability you win the first game is 0.4. If you win the first game, the prob

koban [17]

Answer:

a) No, because the probabilities of winning the 2nd game are dependant on the result of the 1st game. The probabilities are different if you win or lose the first game.

b) P=0.42

c) P=0.08

X | P(X)

------------------

0 | 0.42

1 | 0.50

2 | 0.08

e) E(x)=0.66

s.d.=0.62

Step-by-step explanation:

a) No, because the probabilities of winning the 2nd game are dependant on the result of the 1st game. The probabilities are different if you win or lose the first game.

b) The probability of losing the first game is

$P(G_1=L)=1-P(G_1=W)=1-0.4=0.6$

The probability of losing the second game, given that the first game was lost is:

$P(G_2=L|G_1=L)=1-P(G_2=W|G_1=L)=1-0.3=0.7$

So the probability of losing both games is:

$P(G_2=L\&G_1=L)=P(G_1=L)*P(G_2=L|G_1=L)=0.6*0.7=0.42$

c) The probability of winning both games is:

$P(G_2=W\&G_1=W)=P(G_1=W)*P(G_2=W|G_1=W)=0.4*0.2=0.08$

d) The variable X can take values 0, 1 and 2.

X=0 is when both games are lost. This happens with probability P=0.42.

X=2 is when both games are won. This happens with probability P=0.08.

X=1 is when one game is won and the other is lost. This happens with probability P=1-0.42-0.08=0.50.

Then the table of probabilities become:

X | P(X)

------------------

0 | 0.42

1 | 0.50

2 | 0.08

e) The expected value is:

$E(x)=\sum p_ix_i=0.42*0+0.50*1+0.08*2=0.00+0.50+0.16=0.66$

The variance and standard deviation of x are:

$V(x)=\sum p_i(x_i-E(x))^2\\\\V(x)=0.42(0-0.66)^2+0.50(1-0.66)^2+0.08(2-0.66)^2\\\\V(x)=0.42*0.4356+0.50*0.1156+0.08*1.7956\\\\V(x)=0.183+0.058+0.144=0.385\\\\\\\sigma=\sqrt{V(x)}=\sqrt{0.385}=0.62$

The standard deviation can

5 0

3 years ago

Describe in words how to find the surface area of a cylinder if the radius is 5cm and height is 18cm. The formula is =+.Once you

nordsb [41]

Surface area of cylinder is 2(pi)r^2 + 2(pi)rh
r=5cm
h=18cm
*fill in
50pi + 180pi = 230pi

3 0

3 years ago

Segment AB is congruent to segment AB.<br><br> This statement shows the_________ property.

Alex Ar [27]

Reflexive Property, the property where the quantity equals itself.

4 0

3 years ago

Find the area of each figure. Round your answer to the nearest tenth.

Pie

Answer:

17. 9 yd^2

18. 37.5 yd^2 ( I'm not sure it is the right one.)

Step-by-step explanation:

17. 3*3 =9

18. 5*15/2=37.5 yd^2

5 is the side of the pentagon

6 0

2 years ago