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lord [1]
3 years ago
13

What is a word problem for the problem 8b+6=38

Mathematics
1 answer:
Elden [556K]3 years ago
4 0
Rosie went to the mall to buy new shirts for school. The store she was shopping in had a sale in which all the shirts were $8 each as long as she also bought one pair of shorts for $6. If Rosie spent $38 how many shirts did she buy?
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Construct a​ 95% confidence interval for the population​ mean, mu. Assume the population has a normal distribution. A random sam
aniked [119]

Given Information:  

Number of lithium batteries = n = 16

Mean life of lithium batteries = μ = 645 hours

Standard deviation of lithium batteries = σ = 31 hours

Confidence level = 95%  

Required Information:  

Confidence Interval = ?

Answer:  

CI = 628.5 \: to \: 661.5 \: hours

Step-by-step explanation:  

The confidence interval is given by

CI = \mu \pm t_{\alpha/2} (\frac{\sigma}{\sqrt{n}})

Where μ is the mean life of lithium batteries, σ is the standard deviation, n is number of lithium batteries selected, and t is the critical value from the t-table with significance level of

tα/2 = (1 - 0.95) = 0.05/2 = 0.025

and the degree of freedom is

DoF = n - 1 = 16 - 1 = 15

The critical value (tα/2) at 15 DoF is equal to 2.131 (from the t-table)

CI = 645 \pm 2.131(\frac{31}{\sqrt{16}})

CI = 645 \pm 2.131(7.75})

CI = 645 \pm 16.515

CI = 645 - 16.515 \: and \: 645 + 16.515

CI = 628.5 \: to \: 661.5 \: hours

Therefore, the 95% confidence interval is 628.5 to 661.5 hours

What does it mean?

It means that we are 95% confident that the mean life of 16 lithium batteries is within the interval of (628.5 to 661.5 hours)

6 0
3 years ago
Which formula should be used to find the circumference of a circle
aleksandrvk [35]


If a circle has radius
R, its circumference equals to
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Determine if an exponential would be an appropriate model for the data shown in each scatter plot. Select
cluponka [151]

Answer:

Yes, No, No

Step-by-step explanation:

The function of an exponential graph is attached below. The first graph fits the look of an exponential graph. The rest do not.

7 0
2 years ago
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What's 6+89 .help me pls I'm going to kermit sewer side
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Answer:

95

Step-by-step explanation:

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The East Side Bulldogs and the West Side Bears are playing a football game. A fan is keeping score using T for a touchdown, wort
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Answer:

touchdown babay

Step-by-step explanation:

score touchdowns

7 0
3 years ago
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