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2 years ago

I need duh helpssssssssssss

Mathematics

1 answer:

marin [14]2 years ago

3 0

4 2/6 + 3 3/6 + 2 3/6 = 10 2/6

10 2/6 / 1/3 = 31 bags

Answer is B

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Let the abbreviation PSLT stand for the percent of the gross family income that goes into paying state and local taxes. Suppose

gavmur [86]

Answer:

Number of families that should be surveyed if one wants to be 90% sure of being able to estimate the true mean PSLT within 0.5 is at least 43.

Step-by-step explanation:

We are given that one wants to estimate the mean PSLT for the population of all families in New York City with gross incomes in the range $35.000 to $40.000.

If sigma equals 2.0, we have to find that how many families should be surveyed if one wants to be 90% sure of being able to estimate the true mean PSLT within 0.5.

Here, we will use the concept of Margin of error as the statement "true mean PSLT within 0.5" represents the margin of error we want.

SO, Margin of error formula is given by;

Margin of error = $Z_(_\frac{\alpha}{2}_ ) \times \frac{\sigma}{\sqrt{n} }$

where, $\alpha$ = significance level = 10%

$\sigma$ = standard deviation = 2.0

n = number of families

Now, in the z table the critical value of x at 5% ( $\frac{0.10}{2} = 0.05$ ) level of significance is 1.645.

SO, Margin of error = $Z_(_\frac{\alpha}{2}_ ) \times \frac{\sigma}{\sqrt{n} }$

0.5 = $1.645 \times \frac{2}{\sqrt{n} }$

$\sqrt{n} =\frac{2\times 1.645 }{0.5}$

$\sqrt{n} =6.58$

n = $6.58^{2}$

= 43.3 ≈ 43

Therefore, number of families that should be surveyed if one wants to be 90% sure of being able to estimate the true mean PSLT within 0.5 is at least 43.

4 0

2 years ago

Draw a rectangle that has an area of 8 square units and a perimeter of 12 units. What are the side lengths of the rectangle?

Alex73 [517]

Perimeter = 12
2(w+l) = 12
w + l = 6

area = 8
w x l = 8

the possibility
length = 4
width = 2

i know you can draw it

5 0

2 years ago

Read 2 more answers

Find the solutions of each equation on the interval [0, 2π)

Schach [20]

Answer/Step-by-step explanation:

Factor this. GCF=2

2(2cos2x+cos x-1)=0

2(2cos x -1)(cos x+1)=0 Set each factor equal to zero and solve

2cos x -1=0 Add 1 to both sides

2cos x =1 Divide by 2

cos x =1/2

x=π/3

x=5π/3

cos x+1=0 Subtract 1 from both sides

cos x=-1

x = π

4 0

2 years ago

Please help solve this

neonofarm [45]

F(x)= (x+13)(x-2) in expanded form, it would be x^2+11x-26

5 0

2 years ago

Mary Hernandez had a policy with a $500 deductible which paid 80% of her covered charges less deductible. She had medical expens

12345 [234]

A.) The insurance company's payment is 80% of the total minus the $500 deductible, so:
(10000 - 500) * .8 = 7600

B.) To find the Copay, you do almost the same thing:
(10000 - 500) * .2 = 1900

C.) Mary's Total Cost: 1900 + 500 = 2400.00

4 0

2 years ago