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sveta [45]
3 years ago
11

0.12(y - 9) + 0.06y = 0.02y - 2

Mathematics
1 answer:
IceJOKER [234]3 years ago
4 0
The answer to your problem is y=-5.75
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What is the probability that a random sample of 12 second grade students results in a mean reading rate of more than 95 words pe
mihalych1998 [28]

The probability that a random sample of 12 second grade students results in a mean reading rate of more than 95 words per minute is 0.4582.

Given that the population mean, \mu = 90 wpm

The standard deviation of the population ,\sigma = 10

Sample size, n = 12

Sample mean, \bar x = 95

The reading rate of students follows the normal distribution.

Let z = \frac{\bar x - \mu}{\frac{\sigma}{\sqrt n} }

        = \frac{95 - 90}{\frac{10}{\sqrt 12} }

        = 1.732

Probability that the mean reading exceeds 95 wpm = P(\bar x >95)

                                                                                       = P(z>1.732)

                                                                                       = 1- P(z<1.732)

                                                                                       = 0.4582

[The value 0.4582 found from the area under the normal curve using tables].

Learn more about Normal Distribution at brainly.com/question/27701525

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6 0
2 years ago
If the radius of a circle is 10 feet, how long is the arc subtended by an angle measuring 81°?
LenKa [72]
Circumference of the entire circle = 2 * PI * radius
circumference = 2 * PI * radius
circumference = <span> <span> <span> 62.832
81 degrees is (81 / 360) or .225 of the entire circumference
so the 81 degree arc = .225 * 62.832 = 14.137 feet

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3 0
3 years ago
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A store owner has 17.25 lbs. of candy. If she puts the candy into 7.5 jars, how much candy will each jar contain? HELP PLEASEEE
Firdavs [7]

9.75

Step-by-step explanation:

7 0
3 years ago
If x = 3 and y = 5, work out the value of 4x-2y and 2x² + 3y²
natulia [17]

Answer:

4 × 3 - 2 × 5 = 12 - 10 = 2

2x² + 3y² = 2 × 9 + 3 × 25 = 18 + 75 = 93

4 0
3 years ago
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What is the length of each edge of a cube if its surface area is 486 square units
deff fn [24]

Answer: 9 units


Step-by-step explanation:


3 0
4 years ago
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