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2 years ago

Mark and eight of his friends went out to

2 answers:

6 0

If mark and 8 of his friends went out the total of people is 9, so if you think about it 9x9=81 so the total cost of the bill was $81

melamori03 [73]2 years ago

3 0

72 EXPLANTION 9+9+9+9+9+9+9+9+9=72

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Circumference and Area of a circle <br><br> #5 please

vlada-n [284]

Answer: the circumference is 25.13 and the area is 50.26 if rounding up then 50.27

Step-by-step explanation: to find circumference it is 2piR and to find the area it is piR^2

4 0

3 years ago

It costs $15 to send 3 packages through a certain shipping company. Consider the number of packages per dollar. a. Find the cons

Contact [7]

x is the number of packs 3x=15$ x=5$

6 0

2 years ago

Which of these expressions have positive values and which have negative values? Drag and drop each expression

marusya05 [52]

Answer:

7-(-4)= Positive

-3+(-2)= Negative

5-8= Negative

-10 +12= Positive

Step-by-step explanation:

4 0

3 years ago

Solve, cross multiply<br><br>(x+2) / 2x = 3/2

bonufazy [111]

Answer:

Step-by-step explanation:

x+2/2x=3/2

2x×3=2x+4

6x=2x+4

4x=4

x=4/4

x=1

5 0

2 years ago

The number of hours worked per year per person in a state is normally distributed with a standard deviation of 39. A sample of 1

evablogger [386]

Answer:

The 98% confidence interval for the population mean number of hours worked per year per person is (2146, 2193).

Step-by-step explanation:

The question is incomplete.

The number of hours registered in the sample are:

2051 2061 2162 2167 2169 2171

2180 2183 2186 2195 2196 2198

2205 2210 2211

The sample mean can be calculated as:

$M=\dfrac{1}{n}\sum_{i=1}^n\,x_i\\\\\\M=\dfrac{1}{15}(2051+2061+2162+2167+2169+2171+2180+2183+2186+2195+2196+2198+2205+2210+2211)\\\\\\M=\dfrac{32545}{15}\\\\\\M=2169.67\\\\\\$

We have to calculate a 98% confidence interval for the mean.

The population standard deviation is know and is σ=39.

The sample mean is M=2169.67.

The sample size is N=15.

As σ is known, the standard error of the mean (σM) is calculated as:

$\sigma_M=\dfrac{\sigma}{\sqrt{N}}=\dfrac{39}{\sqrt{15}}=\dfrac{39}{3.873}=10.07$

The z-value for a 98% confidence interval is z=2.326.

The margin of error (MOE) can be calculated as:

$MOE=z\cdot \sigma_M=2.326 \cdot 10.07=23.43$

Then, the lower and upper bounds of the confidence interval are:

$LL=M-t \cdot s_M = 2169.67-23.43=2146\\\\UL=M+t \cdot s_M = 2169.67+23.43=2193$

The 98% confidence interval for the population mean is (2146, 2193).

3 0

3 years ago