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bekas [8.4K]
3 years ago
15

A survey asks a random sample of 2500 adults in California if they support an increase in the state sales tax from 7.50% to 7.75

%, with the additional revenue going to education. Let Y denote the number in the sample that say they support the increase. Suppose that 30% of all adults in California support the increase. The mean of Y is:_______
Mathematics
1 answer:
Nadusha1986 [10]3 years ago
3 0

Answer:

E(Y) = 750

Step-by-step explanation:

Given

Sample Size = 2500

Percentage = 30%

Required

Calculate Mean of Y

Mean or Expected Value is calculated as thus;

E(Y) = np

Where E(Y) represents the mean

n represents the sample size (or population)

p represents the success probability

n = 2500 ; p = 30%%

p = \frac{30}{100} = 0.3

So,

E(Y) = 2500 * 0.3

E(Y) = 750

Hence, the mean value of Y is 750

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Suppose a family has a gross annual income of ​$39,600.
Natalka [10]
According to financial advisers,
<span>* mortgage payment should be at most </span><span>28% of your gross monthly income
</span><span>* total monthly debt should be at most </span><span>36% of your gross monthly income.  Total monthly debts include </span><span>mortgage payments, car payments, credit card bills, student loans, and medical debt.\</span>

<span>gross annual income: 39,600</span>

gross monthly income: 39,600 / 12 = 3,300

a) maximum amount for monthly mortgage payment: 3,300 x 28% = 924

b) maximum amount for total credit obligations: 3,300 x 36% = 1,188

c) mortgage: 924 x 70% = 646.80 actual mortgage

1,188 - 646.80 = 541.20 maximum amount they could spend each month for all other debts.

<span>
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8 0
3 years ago
10 POINTS AND BRAINLIEST<br> Please answer all 3 questions attached correctly.
lana66690 [7]

Answer:

#1. Identity #2. 0 #3. No solution

Step-by-step explanation:

#1.

5y + 2 = (1/2)(10y+4)

5y + 2 = 5y + 2

This would be identity as the equation of the left and right are the same. This is not to be confused with no solution(explained below).

#2.

0.5b + 4 = 2(b+2)

0.5b + 4 = 2b + 4

0.5 b - 2b = 0

b = 0

#3.

-3x + 5 = -3x + 10

This equation has no solution because when you try to bring the -3x to one side, the x variable itself gets eliminated. So, how is it different from identity? Well in the first equation, it is true that when we try to bring the 5y one side it eliminates the y variable, however, that is also true for the constants(since if we try to bring the 2 to one side, it will be 2-2 which will equal 0, thus eliminating each other), but in this case, even if we remove the x, the constants will not equal 0, thus it will have no solution.

5 0
3 years ago
Pls help I’ll brainlest ASAP
Ksju [112]

Answer:

I think the answer is B

Explanation:

1.25x10 to the power of 7 =

12,500,000

I hope it helps!

7 0
3 years ago
Helppppppp pleaseeeeeee
pshichka [43]

Answer:

(2a, 2b)

Step-by-step explanation:

(0, 2b)

(2a, 0)

(2a, 2b)

I racked my brain for that.

4 0
3 years ago
Suppose that a box contains 45 light bulbs, of which 36 are good and the other 9 are defective. Consider randomly selecting thre
Andrew [12]

Answer:

Step-by-step explanation:

Given that a box contains 45 light bulbs, of which 36 are good and the other 9 are defective.

Probability for any one to be defective as of now is \frac{36}{45} =0.80

a) P(E) = 0.80

b) After I draw we have 35 good ones and 9 defective

P(F/E) =\frac{35}{44} \\=0.796

c) P(G/EF)

This is the probability for iii bulb to be good given I and II are goog.

Once I and ii are good we have 43 bulbs with 34 good ones

P(G/EF) =\frac{34}{43} \\=0.7907

5 0
3 years ago
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