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2 years ago

Amelia made a line plot of the time she spent exercising last month.

Mathematics

1 answer:

grandymaker [24]2 years ago

5 0

The difference between her longest exercise time and her most frequent exercise time is 1 3/4 minutes

<h3>How to evaluate the difference?</h3>

From the line plot, we have:

Longest exercise time = 31 1/2
Most frequent exercise time = 29 3/4

The difference between these times is:

Difference = 31 1/2 - 29 3/4

Evaluate

Difference = 1 3/4

Hence, the difference between her longest exercise time and her most frequent exercise time is 1 3/4 minutes

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What is the answer? help me

puteri [66]

The answer that I would choose would be C.

5 0

2 years ago

The management of a department store is interested in estimating the difference between the mean credit purchases of customers u

Mkey [24]

Answer:

Step-by-step explanation:

1) Point estimate is the difference between the sample means. Therefore,

A point estimate for the difference between the mean purchases of the users of the two credit cards is = 140 - 125 = $15

2) Margin of error = z√(σ²/n1 + σ2²/n2)

Where

z is the z score from the 95% confidence level. From the normal distribution table, z = 1.96

s1 and s2 are standard deviation for both customers respectively.

Standard deviation = √variance

σ1 = √100 = 10

σ2 = √641 = 25.32

Margin of error = 1.96√(10²/64 + 25.32²/49 = 7.5

At 95% confidence, the margin of error is 7.5

3) The confidence interval for the difference of two population means is expressed as point estimate ± margin of error

Confidence interval = 15 ± 7.5

The upper boundary for the confidence interval is

15 - 7.5 = 7.5

The lower boundary for the confidence interval is

15 + 7.5 = 22.5

A 95% confidence interval estimate for the difference between the average purchases of the customers using the two different credit cards is $7.5 to $22.5

4) Since the population standard deviations are known, we would use the formula to determine the test statistic(z score)

z = (x1 - x2)/(√σ1²/n2 + σ2²/n2)

z = (140 - 125)/√10²/64 + 25.32²/49

z = 1.02

The test statistic for an alpha of .05 is 1.02

4 0

3 years ago

What is 2,001÷83 pls help i need to check my answer

Nina [5.8K]

Answer:

24.11

Step-by-step explanation:

2001 ÷ 83

83×2= 166

200-166=34 bring down the 1

341 ÷ 83

83×4= 332

341-332=9 add a decimal and bring down a 0

90÷83

90-83=7 bring down another 0

70÷83=0 brind down another 0 since 70 cannot be divided by 83 and have a whole number

700÷83

83×8=664

700-664=36

right now you have 24.108

round to the nearest tenth

24.11

7 0

3 years ago

Bippity boppity pls help me find this functions property

Semmy [17]

Answer:

Period ⇒ 40

Amplitude ⇒ 12

Mid-line ⇒ 32

Step-by-step explanation:

The table is counting by 4's and the period is the amount of space between 2 peaks. In this scenario, we can find the peaks by looking for two of the same highest value (44). We can see that x=40 has a value of 44 while the other is actually not shown because it would be located at x=0. Therefore the period is 40

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The amplitude can be found by using the following:

$\frac{1}{2}|max - min|$

Our maximum is 44 and our minimum is 20.

$\frac{1}{2}|44 - 20|$

$\frac{1}{2}|24|$

$\frac{1}{2}(24)$

The amplitude is 12

The amplitude is the distance from the peak to the mid-line. To find the mid-line, we can either subtract our amplitude from our maximum value (44) or add our amplitude to our minimum value (20)

44 - 12 = 32

20 + 12 = 32

Therefore our mid-line is y = 32

~Hope this helps!~

4 0

4 years ago

Which is an exponential decay function

dezoksy [38]

Answer:

should be either b or c

Step-by-step explanation:

ee ni mee ni my nee mo

6 0

2 years ago

Read 2 more answers