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4 years ago

43% of 300 is what number

1 answer:

8 0

129
Find 10% (30) then times by 4 to find 40% (120)
Find 1% (3) then times by 3 to find 3% (9)
Add the 40% to the 3% (120 + 9)
= 129

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The mean number of words per minute (WPM) typed by a speed typist is 149149 with a standard deviation of 1414 WPM. What is the p

Semmy [17]

Answer:

The probability is $P(\= X > x ) = 0.78814$

Step-by-step explanation:

From the question we are given that

The population mean is $\mu = 149$

The standard deviation is $\sigma = 14$

The random number $x = 147.81$

The sample size is $n = 88$

The probability that the sample mean would be greater than $P(\= X > x ) = P( \frac{ \= x - \mu }{\sigma_{\= x} } > \frac{ x - \mu }{\sigma_{\= x} } )$

Generally the z- score of this normal distribution is mathematically represented as

$Z = \frac{ \= x - \mu }{\sigma_{\= x} }$

Now

$\sigma_{\= x } = \frac{\sigma }{\sqrt{n} }$

substituting values

$\sigma_{\= x } = \frac{14 }{\sqrt{88} }$

$\sigma_{\= x } = 1.492$

Which implies that

$P(\= X > x ) = P( Z > \frac{ 147.81 - 149 }{ 1.492} )$

$P(\= X > x ) = P( Z > -0.80 )$

Now from the z-table the probability is found to be

$P(\= X > x ) = 0.78814$

5 0

3 years ago

All I need are four equations of perpendicular lines that is all

Rufina [12.5K]

Answer:

m = −1−4 = 14.

y − y1 = (1/4)(x − x1)

y − 2 = (1/4)(x − 7)

y − 2 = x/4 − 7/4

Step-by-step explanation:

google

7 0

3 years ago

PLEASE HURRY 45 points

ioda

Answer\

Step-by-step explanation:

6 0

2 years ago

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Sam and Charley have a rectangular swimming pool that is 8 feet wide and 14 feet long. They are going to build a tile border aro

aniked [119]

Answer:

The border is 1.5 feet wide

Step-by-step explanation:

The rectangular pool is 8 feet wide and 14 feet long.

Area of pool = (8 × 14) square feet

= 112 square feet.

The pool they are going to build is 75 square feet of tile. Let the width of this pool be x.

Then Length of pool + length of sidewalk = 14 + 2x

Width of pool + width of sidewalk = 8 + 2x

Then

(14 + 2x)(8 + 2x) - 112 = 75

112 + 28x + 16x + 4x² - 112 = 75

4x² + 44x - 75 = 0

Solving this using the quadratic formula

x = [-b ± √(b² - 4ac)]/2a

Where a = 4, b = 44, c = -75

x = [-44 ± √(44² - 4×4×(-75))]/2×4

= [-44 ± √(3236)]/8

= (-44 ± 56)/8

Ignoring the negative value for x

x = (-44 + 56)/8

= 12/8

= 1.5

The border is 1.5 feet wide

7 0

3 years ago

What is 84 divided by -12

Flauer [41]

Answer:

-7

Step-by-step explanation:

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3 years ago

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