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2 years ago

14

There were 17 students in the class at the start of the school year. During the year, three pairs of new students transferred in

to the class. How many students are in the class at the end of the school year?

2 answers:

Mkey [24]2 years ago

6 0

23?
17 originally +2 +2 +2
6+17

emmainna [20.7K]2 years ago

4 0

Answer:

23

Step-by-step explanation:

a pair is 2 so 2 pairs time 3 2x3=6 so 17+6=23

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Answer:

X is the GPA

Y is the Salary

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Standard deviation of Y is 8500

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E(Y)=47200

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a) $y = a+bx$

$b = \frac{\sum(x_i-\bar{x})(y_i-\bar{y})}{\sum(x_i-\bar{x})^2} = \frac{r \times \sqrt{var(X) \times Var(Y)}}{Var(X)} = \frac{0.72 \times \sqrt{0.4^2 \times 8500^2}}{0.4^2} = 15300$

$a=y-bx = 47200-(15300 \times 29) = 2830$

So, slope = 15300

Intercept = 2830

So, equation : $y = 2830+15300x$

b) Your brother just graduated from that college with a GPA of 3.30. He tells you that based on this model the residual for his pay is -$1880. What salary is he earning?

$y = 2830+15300 \times 3.3 = 53320$

Observed salary = Residual + predicted = -1860+53320 = 51440

c)) What proportion of the variation in salaries is explained by variation in GPA?

The proportion of the variation in salaries is explained by variation in GPA = $r^2 = (0.72)^2 =0.5184$

8 0

2 years ago

Which one is the correct answer?

Molodets [167]

The answer selected is the correct answer because all of the other ones are equivalent to each other.

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3 years ago

Approximate the amount of tip for the florist by rounding the cost and the percent gratuity to the nearest ten.

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Answer: Is 9

Step-by-step explanation:

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3 years ago

Read 2 more answers

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3 years ago

A life insurance company sells a $100,000 one year term life insurance policy to a 30-year old male for $475. The probability th

laila [671]

Answer:

The expected value for the insurance company is $392.20.

Step-by-step explanation:

The expected value of a random variable, <em>X</em> is:

$E(X)=x\cdot P(X)$

It is provided that a life insurance company sells a $100,000 one year term life insurance policy to a 30-year old male for $475.

The probability that the male survives the year is, P(S) = 0.999172.

Then the probability that the male does not survives the year is:

P (S') = 1 - P (S)

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Thus, the expected value for the insurance company is $392.20.

4 0

3 years ago