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3 years ago

Record the data on the line plot. <---------------------> 1,3,1,1,2,2,3,3,4,5,4,3,1,2

1 answer:

3 0

1 3
1 2 3
1 2 3 4
<---- 1 2 3 4 5---->
something like this.. where you put the numbers on top of one another in order creating a line plot of your data, with the numbers above the line

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Interpret the y-intercept of the graph

Svetlanka [38]

Answer:

answer is A

Step-by-step explanation:

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3 years ago

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Solve: 14+(5x-7)=19+3x

sdas [7]

The answer is x=6, have a good day!

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A psychology professor assigns letter grades on a test according to the following scheme. A: Top 7% of scores B: Scores below th

NISA [10]

Answer:

The minimum score required for an A grade is 89.8.

Step-by-step explanation:

We are given that a psychology professor assigns letter grades on a test according to the following scheme. A : Top 7% of scores. B : Scores below the top 7% and above the bottom 64%. C : Scores below the top 36% and above the bottom 25%. D : Scores below the top 75% and above the bottom 6%. F : Bottom 6% of scores.

Scores on the test are normally distributed with a mean of 78.4 and a standard deviation of 7.6.

Let X = Scores on the test

SO, X ~ Normal( $\mu=78.4,\sigma^{2} =7.6^{2}$ )

The z-score probability distribution for normal distribution is given by;

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

where, $\mu$ = mean time = 78.4

$\sigma$ = standard deviation = 7.6

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, the minimum score required for an A grade so that it represents Top 7% of scores is given by;

P(X $\geq$ x) = 0.07 {where x is the required minimum score

P( $\frac{X-\mu}{\sigma}$ $\geq$ $\frac{x-78.4}{7.6}$ ) = 0.07

P(Z $\geq$ $\frac{x-78.4}{7.6}$ ) = 0.07

So, the critical value of x in the z table which represents the top 7% of the area is given as 1.4996, that is;

$\frac{x-78.4}{7.6} =1.4996$

${x-78.4}{} =1.4996\times 7.6$

$x$ = 78.4 + 11.39696 = 89.8 or 90

Hence, the minimum score required for an A grade is 89.8.

8 0

3 years ago

Olivia scored 82 points on her first math test of the year.On the second math test she scored 78 points. What is the percent of

nadya68 [22]

There is 4.88% decrease in Olivia's score.

Step-by-step explanation:

Given,

Score on first math test = Old value = 82 points

Score on second math test = New value = 78 points

Change = New value - Old value

Change = 78 - 82 = -4

The negative sign indicates the decrease.

Decrease percent = $\frac{Change}{Old\ value}*100$

Decrease percent = $\frac{4}{82}*100=\frac{400}{82}$

Decrease percent = 4.88%

There is 4.88% decrease in Olivia's score.

Keywords: percentage, difference

Learn more about percentage at:

#LearnwithBrainly

5 0

3 years ago

Please help I’m really bad at math.:(

kirill [66]

Answer:

The following solution is incorrect. The correct value of x is 7.

Step-by-step explanation:

$3(4x - 15) = 39$

Distribute 3 to (4x-15). When distributing, the value outside parentheses is multiplied to all the numbers inside the parentheses. Since the 3 was only multiplied to 4x, the solution is wrong.

$12x - 45 = 39$

Add 45 to both sides.

$12x = 84$

Divide by 12 from both sides.

$x = 7$

5 0

3 years ago