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Natalka [10]
3 years ago
12

7th grade class enrollment went from 80 students to 60 students. What was the percent decrease?

Mathematics
2 answers:
kherson [118]3 years ago
7 0
25% 25% is 20 and 20 is how much decreased out of 80.
Cloud [144]3 years ago
5 0

Answer:

25% decrease

Step-by-step explanation:

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One eighth of a number is less than or equal to 3
siniylev [52]

Answer:

less than

Step-by-step explanation:

4 0
3 years ago
A random sample of n = 9 structural elements is tested for comprehensive strength. We know the true mean comprehensive strength
irinina [24]

Answer:

Probability that the sample mean comprehensive strength exceeds 4985 psi is 0.99999.

Step-by-step explanation:

We are given that a random sample of n = 9 structural elements is tested for comprehensive strength. We know the true mean comprehensive strength μ = 5500 psi and the standard deviation is σ = 100 psi.

<u><em>Let </em></u>\bar X<u><em> = sample mean comprehensive strength</em></u>

The z-score probability distribution for sample mean is given by;

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

where, \mu = population mean comprehensive strength = 5500 psi

            \sigma = standard deviation = 100 psi

The Z-score measures how many standard deviations the measure is away from the mean. After finding the Z-score, we look at the z-score table and find the p-value (area) associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X.

Now, Probability that the sample mean comprehensive strength exceeds 4985 psi is given by = P(\bar X > 4985 psi)

    P(\bar X > 4985 psi) = P( \frac{\bar X -\mu}{\frac{\sigma}{\sqrt{n} } } > \frac{4985-5500}{\frac{100}{\sqrt{9} } } ) = P(Z > -15.45) = P(Z < 15.45)

                                                                  = <u>0.99999</u>

<em>Since in the z table the highest critical value of x for which a probability area is given is x = 4.40 which is 0.99999, so we assume that our required probability will be equal to 0.99999.</em>

4 0
3 years ago
On the board, your teacher shows an example of finding the range.
Gnesinka [82]
The answer is C: the missing number is 25
3 0
3 years ago
Read 2 more answers
Cindy is facing South through how many degrees should she turn clockwise to face East? a. 90° b. 180° c. 270° d. 360° e. Other:
julia-pushkina [17]

Answer:

90°

Step-by-step explanation:

because from south to east is half of north which makes it 90°

4 0
3 years ago
HELP PLEASE<br><br><br> SHOW WORK<br> WILL MARK BRAINLIEST
defon

I've attached a photo of the solution below. Hope it helps!

3 0
2 years ago
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