2/3x -2 =2 what does x equal

Can someone help me with number 2 plzzzz!!!!

Ulleksa [173]

Answer:

Is

Step-by-step explanation:

Correct answer is A I think

5 0

3 years ago

eva is working two summer jobs, making $9 per hour landscaping and $14 per hour clearing tables. Last week eva earned a total of

Mariulka [41]

so she makes $23 each hour because 9+14=23
last week she earned a total of $74? and worked as twice as many hours..ok so she worked about 3 hours last week

4 0

3 years ago

xP(x)00.2510.0520.1530.55Find the standard deviation of this probability distribution. Give your answer to at least 2 decimal pl

Nookie1986 [14]

The Solution:

Given:

Required:

Find the standard deviation of the probability distribution.

Step 1:

Find the expected value of the probability distribution.

$E(x)=\mu=\sum_{i\mathop{=}0}^3x_iP_(x_i)$ $\begin{gathered} \mu=(0\times0.25)+(1\times0.05)+(2\times0.15)+(3\times0.55) \\ \\ \mu=0+0.05+0.30+1.65=2.0 \end{gathered}$

Step 2:

Find the standard deviation.

$Standard\text{ Deviation}=\sqrt{\sum_{i\mathop{=}0}^3(x_i-\mu)^2P_(x_i)}$ $=(0-2)^2(0.25)+(1-2)^2(0.05)+(2-2)^2(0.15)+(3-2)^2(0.55)$ $=4(0.25)+1(0.05)+0(0.15)+1(0.55)$ $=1+0.05+0+0.55=1.60$

Thus, the standard deviation is 1.60

Answer:

1.60

8 0

2 years ago

In a different plan for area codes, the first digit could be any number from 4 through 8, the second digit was either 3, 4, 5,

Snezhnost [94]

For the first digit, we have 5 options that are 4,5,6,7,8 . For the second digit, we have 4 options which are 3,4,5 or 6 and for the third digit, we have the options of all numbers except 2 or 5 that is 1,3,4,6,7,8,9,0 . SO we have 8 options for third digit . So to find the total number of options, we need to multiply all the possible options for each digit that is 5 times 4 times 8 = 160 . So the number of possible options are 160 .

7 0

4 years ago

What percentage of the population has a heart rate between 68 and 77

velikii [3]

Answer:

49.87% of the population has a heart rate between 68 and 77.

Step-by-step explanation:

We are given that the mean of the data for the resting heart of adults is 68 beats per minute and the standard deviation is 3 beats per minute.

Let X = <u><em>the data for the resting heart of adults</em></u>

The z-score probability distribution for the normal distribution is given by;

Z = $\frac{X-\mu}{\sigma}$ ~ N(0,1)

where, $\mu$ = population mean = 68 beats per minute

$\sigma$ = standard deviation = 3 beats per minute

Now, the percentage of the population that has a heart rate between 68 and 77 is given by = P(68 < X < 77)

P(68 < X < 77) = P(X < 77) - P(X $\leq$ 68)

P(X < 77) = P( $\frac{X-\mu}{\sigma}$ < $\frac{77-68}{3}$ ) = P(Z < 3) = 0.9987

P(X $\leq$ 68) = P( $\frac{X-\mu}{\sigma}$ $\leq$ $\frac{68-68}{3}$ ) = P(Z $\leq$ 0) = 0.50

The above probability is calculated by looking at the value of x = 3 and x = 0 in the z table which has an area of 0.9987 and 0.50 respectively.

Therefore, P(68 < X < 77) = 0.9987 - 0.50 = 0.4987 or 49.87%

8 0

4 years ago