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Nat2105 [25]
3 years ago
7

Candidates for employment at a city fire department are required to take a written aptitude test. scores on this test are normal

ly distributed with a mean of 280 and a standard deviation of 60. a random sample of nine test scores was taken.
Mathematics
1 answer:
Gnesinka [82]3 years ago
7 0
<span>If a sample of 9 test scores is taken, there is approximately a 68% chance that the scores will be between the scores of 220 and 340, a 95% chance that they will be between 160 and 400 and a 99.7% chance the scores will be between 100 and 460.</span>
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A farmer has enough feed to last his 15pigs for 20days. How long would the feed last if he had 10pigs​
ddd [48]

40/3 days, (13.33 days)

Step-by-step explanation:

Set up the equation, 15/20 = 10/x, and then use cross mutiply to solve it.

10 * 20 = 15x, x = 200/15 = 40/3

Why?

b/c if each pig eats the same amount of food, then the ratio between the number of pigs and days should remain constant.

5 0
3 years ago
A. -5<br> B. 5<br> C. -2<br> D. 3
Anna71 [15]

Answer:

\textsf {C. -2}

Step-by-step explanation:

\textsf{In the equation y = mx + b, m is the slope and} \\\textsf{b is the value of the y-intercept.}

\textsf {The line has a y-intercept at (0, -2), hence b = -2.}

5 0
2 years ago
Round to the nearest hundredth:<br><br> 0.13658537
Montano1993 [528]

Answer is 0.14

in nearest

3 0
3 years ago
Read 2 more answers
What is the root of the quadratic equation x^2 - 8x + 16 = 0
Semenov [28]

Answer:

(x - 4)(x - 4)

x = 4

Step-by-step explanation:

x² - 8x + 16

= (x - 4)(x - 4)

x - 4 = 0

x = 4

3 0
3 years ago
Help me with this please
Klio2033 [76]

Answer:

No, she's wrong

x\leq\frac{2}{5}

Step-by-step explanation:

So starting from the beginning...

3x+3\leq -2x+5

Subtract the 3 from both side and it will look like...

3x\leq-2x+2

Then add 2x from both sides and it will look like...

5x\leq 2

Finally divide by 5 to both sides and it will look like...

x\leq \frac{2}{5}

4 0
2 years ago
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