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denis-greek [22]
3 years ago
11

GIVING BRAINLIEST! 20 POINTS!

Mathematics
1 answer:
alexgriva [62]3 years ago
4 0

Answer:

B.

Step-by-step explanation:

A graph would go by 20 and 1 so B is correct.

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An English professor assigns letter grades on a test according to the following scheme. A: Top 5% of scores B: Scores below the
tangare [24]

Answer:

Grade D score:

69 \leq x \leq 74

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 78.8

Standard Deviation, σ = 7.1

We are given that the distribution of scores on test is a bell shaped distribution that is a normal distribution.

Formula:

z_{score} = \displaystyle\frac{x-\mu}{\sigma}

D: Scores below the top 77% and above the bottom 9%

We have to find the value of x such that the probability is 0.77

P( X > x) = P( z > \displaystyle\frac{x - 78.8}{7.1})=0.77  

= 1 -P( z \leq \displaystyle\frac{x - 78.8}{7.1})=0.77  

=P( z \leq \displaystyle\frac{x - 78.8}{7.1})=0.23  

Calculation the value from standard normal z table, we have,  

\displaystyle\frac{x - 78.8}{7.1} =-0.739\\\\x = 73.55  

We have to find the value of x such that the probability is 0.09

P(X < 0.09) = \\\\P( X < x) = P( z < \displaystyle\frac{x - 78.8}{7.1})=0.09

Calculation the value from standard normal z table, we have,  

\displaystyle\frac{x - 78.8}{7.1} = -1.341\\\\x = 69.27  

Thus, the numerical value of score to achieve grade D is

69 \leq x \leq 74

6 0
3 years ago
Look Down Below For question:
Ray Of Light [21]
The cattle train
speed - 36.5 km/h
time - x h

the passenger train
speed - 29.2 km/h
time - (2.4+x) h

The cattle train caught up to the passenger train so the distance they travelled is the same.
Distance is speed times time.

36.5 \times x=29.2 \times (2.4+x) \\&#10;36.5x=70.08+29.2x \\&#10;36.5x-29.2x=70.08 \\&#10;7.3x=70.08 \\&#10;x=\frac{70.08}{7.3} \\&#10;x=9.6 \\ \\ 2.4+x=2.4+9.6=12

The passenger train travelled for 12 hours before the cattle train caught up.
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3 years ago
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vodomira [7]

Answer:

D (6,2)

Step-by-step explanation:

2x6+2=14 2x6= 12 12+2= 14

5x6-2=28 5x6=30 30-2=28

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3 years ago
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kifflom [539]
The slope is zero
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Anna [14]
James is 10 years old right now.
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