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Andrei [34K]
3 years ago
10

Help plsssssssssshgruffgfieubf3rg;3

Mathematics
2 answers:
mina [271]3 years ago
8 0
I’m pretty sure it’s a and c
Ahat [919]3 years ago
7 0

A, C, and D, are the correct ones I believe.

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The mayor is interested in finding a 95% confidence interval for the mean number of pounds of trash per person per week that is
baherus [9]

Answer:

(30.09, 32.91)

Step-by-step explanation:

Mean number of pounds of trash = x = 31.5 pounds

Standard deviation = s = 7.8 pounds

Sample size = n = 120

Confidence level = 95%

Since, we are given the sample standard deviation instead of the population standard deviation, we will use t-test to find the confidence interval.

Degrees of freedom = df = n - 1 = 120 - 1 = 119

The t-value associated with 95% confidence interval and df=119 from the t-table comes out to be:

t = 1.98

The formula to calculate the confidence interval is:

(x-t\frac{s}{\sqrt{n}}, x+t\frac{s}{\sqrt{n}})\\

Using the values in above expression we get:

(31.5-1.98\times\frac{7.8}{\sqrt{120}}, 31.5+1.98\times\frac{7.8}{\sqrt{120}})\\\\ =(30.09,32.91)

Thus, the 95% confidence interval for the mean number of lbs of trash per person per week that is generated in the city is (30.09, 32.91)

6 0
3 years ago
You bake cookies for a bake sale. The ratio of chocolate chip cookies to oatmeal cookies is 7 : 5. You bake 15 oatmeal cookies.
Inga [223]

Answer: 21?

Step-by-step explanation: if the ratio is 7:5 and its now x:15 and 15 divided by 5 is three so you have to multiply 7 by three to.

4 0
3 years ago
Read 2 more answers
Elimination using addition and subtraction <br> -3x - y = 24 ; 3x - 2y = 3
lozanna [386]

Answer:

x=5

y=6

Step-by-step explanation:

this may be wrong

5 0
3 years ago
Read 2 more answers
What is 3.45 * 10^8 please explain your answer
sergiy2304 [10]
3.45\cdot10^8=3.45\cdot100,000,000=345,000,000
5 0
4 years ago
Which expression is equivalent to 8?<br><br><br> -48 ÷ 6<br> 48 ÷ (-6)<br> 48 ÷ 6<br> -48 ÷ (-6)
V125BC [204]
Expression 3, 
because 6 and 8 are factors of 48. Since positive 6 & 8 are the two numbers of choice, the product will be positive. My answer is reasonable because if you were to multiply positive 8 and 6 you will get positive 48.
8 0
3 years ago
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