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3 years ago

Steve received the following test scores, 78, 83, 79. Find Steve's average.

1 answer:

7 0

To find the average, add up all the numbers, then divide by how many numbers there are

(78 + 83 + 79) / 3 = 240/3 = 80 <== average

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What is |-26|? (a) -26, (b) 26, (c) 0, (d) 1

S_A_V [24]

Answer:

(b)26

Step-by-step explanation:

Step 1: Isolate the absolute value expression.

Step2: Set the quantity inside the absolute value notation equal to + and - the quantity on the other side of the equation.

Step 3: Solve for the unknown in both equations.

Step 4: Check your answer analytically or graphically.

4 0

3 years ago

According to the U.S. National Transportation Safety Board, the number of airline accidents by year from 1983 to 2006 were 23, 1

Lera25 [3.4K]

Answer:

$\bar X= 33.79167$

$s= 12.06497$

$SE= \frac{s}{\sqrt{n}}= \frac{12.06497}{\sqrt{24}}=2.463$

$Median= \frac{30+31}{2}= 30.5$

Step-by-step explanation:

For this case we have the following data:

23, 16, 21, 24, 34, 30, 28, 24, 26, 18, 23, 23, 36, 37, 49, 50, 51, 56, 46, 41, 54, 30, 40, and 31

We can calculate the sample mean with the following formula:

$\bar X = \frac{\sum_{i=1}^n X_i}{n}$

And replacing we got:

$\bar X= 33.79167$

Then we can calculate the standard deviation with this formula:

$s= \sqrt{\frac{\sum_{i=1}^n (X_i -\bar X)^2}{n-1}}$

And replacing we got:

$s= 12.06497$

And the sample size for this case is n =24. We can calculate the standard error with this formula:

$SE= \frac{s}{\sqrt{n}}= \frac{12.06497}{\sqrt{24}}=2.463$

And the median for this case since the sample size is 24 first we need to sort the data on increasing order and we got:

16 18 21 23 23 23 24 24 26 28 30 30 31 34 36 37 40 41 46 49 50 51 54 56

And for this case the median would be the average from the position 12 and 13 and we got:

$Median= \frac{30+31}{2}= 30.5$

4 0

3 years ago

Help I need to answer this in less than 20 minsss!!!!

Natali5045456 [20]

The last answer is correct, Solved it.

5 0

3 years ago

Solve the exponential equation for x 625=5^(7x-3)

LekaFEV [45]

$625 = 5^{7x-3} \\$

Create equivalent bases:

$625 = 5^4\\5^4 = 5^{7x-3}$

Since the bases are equal, then exponent1 = exponent2 in order for this equation to be true.

$7x - 3 = 4\\7x = 7\\x = 1$

Check the answer:

$5^{7(1) - 3}\\5^{7 - 3}\\5^4\\625 = 625$

Our answer is correct,

x = 1

8 0

3 years ago

Read 2 more answers

What is the unit rate as a simplified fraction? Thanks for the help;)

Trava [24]

Divide the y-value by the x-value.

(1/2) / (2/5) = 1/2 x 5/2 = 5/4

6 0

3 years ago