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Andrej [43]
3 years ago
10

Suppose in a representative sample of adult Americans ages 26 to 32 years, 27% indicated that they owned a fitness band that kep

t track of the number of steps walked each day and their daily activity levels. Suppose that the sample size was 500. Is there convincing evidence that more than one-quarter of all adult Americans in this age group own a fitness band
Mathematics
1 answer:
DanielleElmas [232]3 years ago
6 0

Answer: Yes, we have.

Step-by-step explanation:

Going by the details provided, Probability of success of choosing a citizen with a fitness band 27%

The probability function for expected value shows the Formula to know with sufficient dependence what proportion of the sampled people will have the fitness band.

Since 27% of 500 = 135.

and 135 is more than a quarter of 500(125), then we have enough Evidence that more than a quarter of this age group own a fitness band.

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A rock band is playing a concert at Music Hall 49, which has 2,500 seats. If 80% of the tickets were sold before the night of th
nasty-shy [4]

First you must see how many seats were bought. To do this you must make a proportion

\frac{part}{whole} = \frac{part}{whole}

80 is a percent and percent's are always taken out of the 100. This means that one proportion will have 80 as the part and 100 as the whole

We want to know what 80% of 2,500 is in order to find how many seats were sold before the show. This means 2,500 is the whole and the unknown (let's make this x) is the part.

Here is your proportion:

\frac{x}{2,500} =\frac{80}{100}

Now you must cross multiply

x*100 = 80*2,500

100x = 200,000

To isolate x divide 100 to both sides

100x/100 = 200,000/100

x = 2,000

This means that before the night of the concert 2,000 seats were bought.

We are still not done with this problem because we want to know how many seats are left the night of the concert. To find this simply subtract 2,000 from the number of original seating (2,500)

2,500 - 2,000 = 500

On the night of the concert there were 500 seats left.

Hope this helped!

~Just a girl in love with Shawn Mendes

5 0
3 years ago
Graph f(x)=12x+2.i need help
AveGali [126]

Answer:

Slope:12 y-Intercept:2

Step-by-step explanation:

Graph the line using the slope and y-Intercept, or two points.

x | y

0 | 2

1 | 14

4 0
3 years ago
Find the value of 4^2 + 6^2
seraphim [82]

Answer:

52

Step-by-step explanation:

4^2=4×4=16

6^2=6×6=36

16+36=52

4 0
3 years ago
The points (12,23) and (14,45) lie on a line.<br> What is the slope of the line?
Irina18 [472]

Answer:11

Step-by-step explanation:

so that is easy it is rise over run!!!

y2-y1 over x2-x1!!! look at picture!!!

3 0
2 years ago
Suppose Brianna invests $1,300 each year for 5 years, in an annuity that pays 6% annual interest, compounded annually. What perc
love history [14]

Answer:

74.73%

Step-by-step explanation:

First, we're gonna find out her total amount

We're gonna use the count interest formula: P = A(1 + r)ⁿ

P = final amount

A = starting amount (1300)

r = rate (0.06)

n = years (5)

P = 1300(1 + 0.06)⁵

P = 1739.693251

Now divide the starting amount by the total amount

1300 ÷ 1739.693251 = 0.7472582

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2 years ago
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