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4 years ago

Please help me ASAP!!!

Mathematics

1 answer:

ZanzabumX [31]4 years ago

5 0

Answer:

Step-by-step explanation:

Use guess and check method. Plug in 15 for x in each of the given expressions on your calc to find which ones are the correct answers.

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Circle groups to show 3*(2*3)

strojnjashka [21]

Circle a 2 by 3 area (6 squares) on the array. 0 0 0
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3 years ago

In a random sample of 7 residents of the state of Maine, the mean waste recycled per person per day was 1.4 pounds with a standa

ivolga24 [154]

Answer:

a) The 95% confidence interval for the mean waste recycled per person per day for the population of Maine is between 1.19 and 1.61 pounds.

b) $T_c = 2.4469$

Step-by-step explanation:

We have the standard deviation for the sample, which means that the t-distribution is used to solve this question.

The first step to solve this problem is finding how many degrees of freedom, we have. This is the sample size subtracted by 1. So

df = 7 - 1 = 6

95% confidence interval

Now, we have to find a value of T, which is found looking at the t table, with 6 degrees of freedom(y-axis) and a confidence level of $1 - \frac{1 - 0.95}{2} = 0.975$ . So we have T = 2.4469, and the answer to question b is $T_c = 2.4469$

The margin of error is:

$M = T\frac{s}{\sqrt{n}} = 2.4469\frac{0.23}{\sqrt{7}} = 0.21$

In which s is the standard deviation of the sample and n is the size of the sample.

The lower end of the interval is the sample mean subtracted by M. So it is 1.4 - 0.21 = 1.19 pounds.

The upper end of the interval is the sample mean added to M. So it is 1.4 + 0.21 = 1.61 pounds.

The 95% confidence interval for the mean waste recycled per person per day for the population of Maine is between 1.19 and 1.61 pounds.

7 0

3 years ago

Question 1

PilotLPTM [1.2K]

answer: where is the question?

5 0

3 years ago

A lemonade stand sells drinks in two sizes, small and medium. In the span of 1 hour, the stand sold 72 drinks. The ratio of smal

Mashutka [201]

Answer:

The total amount of money received at the lemonade stand was $49.50

Step-by-step explanation:

Let

x ---> the number of small drinks sold

y ---> the number of medium drinks sold

we know that

The stand sold 72 drinks

$x+y=72$ ----> equation A

The ratio of small drinks to medium drinks sold was 5:3

$\frac{x}{y}=\frac{5}{3}$

$x=\frac{5}{3}y$ ----> equation B

substitute equation B in equation A

$\frac{5}{3}y+y=72$

$\frac{8}{3}y=72\\\\y=72(3)/8\\\\y=27$

Find the value of x

$x=\frac{5}{3}(27)=45$

Find out the total amount of money received at the lemonade stand

$0.50(45)+1.00(27)=\$49.50$

3 0

3 years ago

Select the correct answer.

Yuki888 [10]

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3 years ago

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