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bekas [8.4K]
3 years ago
5

Need help with this please or explain how to solve it

Mathematics
1 answer:
Aloiza [94]3 years ago
4 0

Answer:

B The cost to use the service for one month if zero songs are downloaded

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7. Of 101 randomly selected adults
DanielleElmas [232]

Answer:

The 95% confidence interval for the true percentage of all adults over 30 who shop at that mall who admit to having lost their car at the mall is (25.37%, 43.93%).

Step-by-step explanation:

In a sample with a number n of people surveyed with a probability of a success of \pi, and a confidence level of 1-\alpha, we have the following confidence interval of proportions.

\pi \pm z\sqrt{\frac{\pi(1-\pi)}{n}}

In which

z is the z-score that has a p-value of 1 - \frac{\alpha}{2}.

Of 101 randomly selected adults over 30 who frequent a very large mall, 35 admitted to having lost their car at the mall.

This means that n = 101, \pi = \frac{35}{101} = 0.3465

95% confidence level

So \alpha = 0.05, z is the value of Z that has a p-value of 1 - \frac{0.05}{2} = 0.975, so Z = 1.96.

The lower limit of this interval is:

\pi - z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.3465 - 1.96\sqrt{\frac{0.3465*0.6535}{101}} = 0.2537

The upper limit of this interval is:

\pi + z\sqrt{\frac{\pi(1-\pi)}{n}} = 0.3465 + 1.96\sqrt{\frac{0.3465*0.6535}{101}} = 0.4393

As percentages:

0.2537*100% = 25.37%

0.4393*100% = 43.93%

The 95% confidence interval for the true percentage of all adults over 30 who shop at that mall who admit to having lost their car at the mall is (25.37%, 43.93%).

4 0
2 years ago
Roger's Diner offers its clients a choice of regular and diet soda. Last night, the diner served 135 regular sodas and 45 diet s
kozerog [31]

Answer:

75% served are regular

Step-by-step explanation:

135+45 =  180 total sodas.

135/180 =  0.75

3 0
3 years ago
Can somebody help me with this problem .<br>3.)find the perimeter of the object below.
AysviL [449]

Answer:

189

Step-by-step explanation:

Multiple 15 by 13 and get 195

Multiply 3 by 2 and get 6

Subtract 195 by 6 and get 189

Hope it helps

7 0
3 years ago
Read 2 more answers
What is 246000000 in standed form need to know whit in 15 min
11Alexandr11 [23.1K]

Answer:

2.46×10^8

Step-by-step explanation:

The decimal point is here

246000000.

Then it must be moved up to here

2.46000000

Those are eight steps from where it was, so to compensate and make sure the number remains the same remove the zeros and multiply by 10^8

Then you have

2.46×10^8

3 0
3 years ago
What is true about angle ABC
abruzzese [7]

Answer:

ab

Step-by-step explanation:

A b and yes it is 1 in a better one day 1

3 0
3 years ago
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