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3 years ago

The two-way table shows the number of students in a school who have bikes and/or skateboards at home:

Mathematics

2 answers:

Rus_ich [418]3 years ago

7 0

The answer to your question is : C. 30
You subtract 72 and 42
72-42=30

solong [7]3 years ago

5 0

The is awsner to the question is c!

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A man who moves to a new city sees that there are two routes he could take to work. A neighbor who has lived there a long time t

Mandarinka [93]

Answer:

(a) Confidence Interval for Route A is (38.61, 41.39)min

Confidence Interval for Route B is (42.07, 43.93)min

(b) No

Step-by-step explanation:

(a) Route A

Mean=40min, sd=3min, df=33.1, t=2.0675, n=20

CI = (mean + or - t×sd/√n)

CI = (40 + 2.0675×3/√20) = 40+1.39 = 41.39min

CI = (40 - 2.0675×3/√20) = 40 - 1.39 = 38.61min

CI for Route A is (38.61,41.39)min

Route B

Mean=43min, sd=2min, t=2.0675, n=20

CI = (43 + 2.0675×2/√20) = 43+ 0.93 = 43.93min

CI = (43 - 2.0675×2/√20) = 43 - 0.93 = 42.07min

CI for Route B is (42.07,43.93)min

(b) He should not believe the old timer's claim. The man saves an average of 3 minutes a day by driving Route A

3 0

3 years ago

Read 2 more answers

The cost of performance tickets and beverages for a family of four can be modeled using the equation 4x + 12 = 48, where x repre

Kisachek [45]

4x + 12 = 48
4x = 48 -12
4x = 36
x= 36 / 4
x= 9

Each ticket is $9.

6 0

4 years ago

Suppose an advertising company wants to determine the current percentage of customers who read print magazines. How many custome

user100 [1]

Answer: 543

Step-by-step explanation:

Given : Level of confidence = 0.98

Significance level : $\alpha=1-0.98=0.02$

By using the normal distribution table,

Critical value : $z_{\alpha/2}=2.33$

Margin of error : $E=5\%=0.05$

The formula to find the population proportion if prior proportion of population is unknown :-

$n=0.25(\dfrac{z_{\alpha/2}}{E})^2$

$\Rightarrow n=0.25(\dfrac{2.33}{0.05})^2=542.89\approx543$

Hence, the company survey minimum sample having size =543

8 0

4 years ago

Read 2 more answers

Please answer this, ILL MARK YOU THE BRAINLIEST

vova2212 [387]

Answer: the answer is (2,-4) if that's not the answer then can u post a full picture of the question

Step-by-step explanation:

4 0

3 years ago

How do you write 7.75 in scientific notation?<br><br><br><br> i neeeed helps asap!

Hunter-Best [27]

Answer:

7.75-10°

Step-by-step explanation:

7 0

3 years ago