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3 years ago

Charley's grade in the three quarters are 85, 88, and 92. If she targets to have an average

Mathematics

1 answer:

topjm [15]3 years ago

5 0

Step-by-step explanation:

We can set up an average equation in the form, where x is the last score in the fourth quarter:

$\frac{85 + 88 + 92 + x}{4} = 90$

$85 + 88+92 + x =360\\\\x = 95$

She needs at least a 95 on the last quarter to average 90 in all four quarters.

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The sample consisted of 50 night students, with a sample mean GPA of 3.02 and a standard deviation of 0.08, and 25 day students,

bulgar [2K]

Answer: The test statistic is t= -0.90.

Step-by-step explanation:

Since we have given that

n₁ = 50

n₂ = 25

$\bar{x_1}=3.02\\\\\bar{x_2}=3.04\\\\\sigma_1=0.08\\\\\sigma_2=0.06$

So, s would be

$s=\sqrt{\dfrac{n_1\sigma_1^2+n_2\sigma_2^2}{n_1+n_2-2}}\\\\s=\sqrt{\dfrac{50\times 0.08^2+25\times 0.06^2}{50+25-2}}\\\\s=0.075$

So, the value of test statistic would be

$t=\dfrac{\bar{x_1}-\bar{x_2}}{s(\dfrac{1}{n_1}+\dfrac{1}{n_2})}\\t=\dfrac{3.02-3.04}{0.074(\dfrac{1}{50}+\dfrac{1}{25})}\\\\t=\dfrac{-0.04}{0.074(0.02+0.04)}\\\\t=\dfrac{-0.04}{0.044}\\\\t=-0.90$

Hence, the test statistic is t= -0.90.

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3 years ago

What would be the answer ?

Blizzard [7]

Answer: $13

Step-by-step explanation:

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3 years ago

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The point (-3,-1) is the midpoint of (x,y) and (5,4). Find the point (x,y).

nirvana33 [79]

Answer:

(-11, -6)

Step-by-step explanation:

Find the distance between the midpoint, (-3, -1) and (5, 4). This can be calculated by finding the difference between the x coordinates and y coordinates.

-3 - 5 = -8 (distance between x coordinates)

-1 - 4 = -5 (distance between y coordinates)

Find the point (x, y) by subtracting 8 from the midpoint's x value, and then subtracting 5 from the midpoint's y value.

-3 - 8 = -11

-1 - 5 = -6

So, the point (x, y) is (-11, -6)

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3 years ago

The weight of Darrin's phone is 3.405 ounces. What is 3.405 written in expanded form

Verizon [17]

Its 3.000+400+5 that's your answer

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3 years ago

If x ≠ 0 then what is x^0?

grigory [225]

Answer:

Step-by-step explanation:

Remember that anything to the 0th power is going to be 1 in terms of exponent rules!

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3 years ago

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