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3 years ago

(a) Fill in the tavle below to complete the proability distrubution of X

Mathematics

1 answer:

Aliun [14]3 years ago

6 0

Answer:

2.6

Step-by-step explanation:

Given :

x 1 2 3 4

P(x) 0.3 0.2 ? 0.4

Σp(x) = 1

Hence, 0.3 + 0.2 +? + 0.4 = 1

0.9 +? = 1

? = 1 - 0.9

? = 0.1

For the mean :

E(X) = ΣX*P(X)

(1 * 0.3) + (2 * 0.2) + (3 *0.1) + (4* 0.4)

0.3 + 0.4 + 0.3 + 1.6 = 2.6

Hence, the mean = 2.6

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PLEASE HELP ME!!! 5 POINTS!!!

lakkis [162]

Answer:

D. 1.38

Step-by-step explanation:

To compare numbers, start with the left side.

You are comparing these numbers with 1.32:

A.1.02

B.1.23

C.1.31

D.1.38

Start with the leftmost digit, the 1. All numbers start with 1, so up to the units place, they are all the same. See below.

1.32

A. 1.02

B. 1.23

C. 1.31

D. 1.38

Now compare the next digit which is the tenths place.

1.32

A. 1.02

B. 1.23

C. 1.31

D. 1.38

Above, the number 1.32 has a 3 in the tenths place. 3 is greater than 0 and than 2, so options A and B are less than 1.32 and are eliminated.

1.32

C. 1.31

D. 1.38

Now we compare the digits in the hundredths place shown just above. 2 is greater than 1, but it is less than 8, so we eliminate option C.

Answer: D. 1.38

7 0

4 years ago

On a bicycle Jack can travel 20 miles in 4 hours. How long will it take him to travel 75 miles?? Please help me

valentinak56 [21]

Make a proportion 20 miles/4 hours= 75miles/x. cross multiply gives you 20x=300. this will give you x = 15 hours

3 0

4 years ago

need help with error analysis assingment, im in high school and ive always struggled with math alot pls help

valina [46]

Given

A) The angles A and B are supplementary.

If,

$\begin{gathered} \angle A=x+6 \\ \angle B=7x+30 \end{gathered}$

B) The figure,

To find

A) The value of x.

B) The value of x.

Explanation:

A) It is given that,

Angle A and angle B are supplementary.

Then,

$\angle A+\angle B=180\degree$

Hence, the error is in the statement,

Since the angles are supplementary, when added together they equal 90.

As, the correct answer is when added together they equal 180.

That implies,

$\begin{gathered} x+6+7x+30=180 \\ 8x+36=180 \\ 8x=180-36 \\ 8x=144 \\ x=\frac{144}{8} \\ x=18\degree \end{gathered}$

Hence, the value of x is 18 degrees.

B) It is given that,

From, the figure the given angles are interior angles.

Also, the interior angles on the same side of the transversal is supplementary.

Which means when you add them they equal 180.

Hence, the error is in the statement,

Since the angles are adjacent, they are complementary angles.

Which means when you add them they equal 180.

As, the angles are interior angles on the same side of the transversal.

Also,

$\begin{gathered} 64+x=180 \\ x=180-64 \\ x=116\degree \end{gathered}$

Hence, the value of x is 116 degrees.

6 0

2 years ago

Solve using the quadratic formula X^2=4x-8

Sergio039 [100]

This is the answer........

7 0

3 years ago

Solve the equation. Graph the solution(s) if possible. ∣x−3∣+4=9

Mazyrski [523]

Answer:

x=8

x=-2

Step-by-step explanation:

∣x−3∣+4=9

= ∣x−3∣=5

Positive term: (x-3)

(x-3) = 5

Rearrange and Add up

x = 8

Negative term: -(x-3)

Multiply

-x+3 = 5

Rearrange and Add up

-x = 2

Multiply both sides by (-1)

x = -2

3 0

3 years ago