If you have $13 and spend $4 on a sandwich, drink and chips, what fraction of your money did you spend?

Write a equation to solve this problem. How much money is 6.4% of $25?

Naddik [55]

If $25 = 100%. Then
Y = 6.4%

Y = (25x6.4) /100 (Equation)

Y= $1.6

7 0

3 years ago

A study of the effect of smoking on sleep patterns is conducted. The measure observed is the time, in minutes, that it takes to

nordsb [41]

Answer:

The group that has greater value of relative dispersion is the smokers group, as the coefficient of variationof their data is bigger than the coefficient of variation of the non-smokers group data.

CV smokers: 0.387

CV non-smokers: 0.234

Step-by-step explanation:

We will calculate the relative dispersion of each data set with its coefficient of variation (ratio of the standard deviation to the arithmetic mean).

Then, first we calculate the mean and standard deviation for the smokers data:

Mean: 43.7

Standard deviation: 286.5

$M_s=\dfrac{1}{n}\sum_{i=1}^n\,x_i\\\\\\M_s=\dfrac{1}{12}(69.3+56+22.1+47.6+53.2+. . .+13.8)\\\\\\M_s=\dfrac{524.4}{12}\\\\\\M_s=43.7\\\\\\s_s=\dfrac{1}{n-1}\sum_{i=1}^n\,(x_i-M_s)^2\\\\\\s_s=\dfrac{1}{11}((69.3-43.7)^2+. . . +(13.8-43.7)^2)\\\\\\s_s=\dfrac{3152}{11}\\\\\\s_s=286.5\\\\\\$

The mean and standard deviation for the non-smokers is:

Mean: 30.3

Standard deviation: 50.9

$M_n=\dfrac{1}{n}\sum_{i=1}^n\,x_i\\\\\\M_n=\dfrac{1}{15}(28.6+25.1+26.4+34.9+28.8+. . .+13.9)\\\\\\M_n=\dfrac{453.8}{15}\\\\\\M_n=30.3\\\\\\s_n=\dfrac{1}{n-1}\sum_{i=1}^n\,(x_i-M_n)^2\\\\\\s_n=\dfrac{1}{14}((28.6-30.3)^2+. . . +(13.9-30.3)^2)\\\\\\s_n=\dfrac{713.3}{14}\\\\\\s_n=50.9\\\\\\$

Now, we can calculate the coefficient of variation:

CV smokers:

$CV_s=\dfrac{s_s}{M_s}=\dfrac{16.9}{43.7}=0.387$

CV non-smokers:

$CV_n=\dfrac{s_n}{M_n}=\dfrac{7.1}{30.3}=0.234$

3 0

4 years ago

Reeeeeeeeeeeeeeeeeeeeeeeeeee help me pls brainliest

Deffense [45]

Answer:

the height of a baseball thrown into the air

Step-by-step explanation:

Bean sprouts do not decline in size in this case

The distance from home will only decline on the graph

The amount of money a student earns would increase in height on the graph

The only logical solution is the height of a baseball thrown into the air because the ball can increase in height, but it also comes down at some point, causing the graph to decrease.

4 0

3 years ago

Rosa wanted to solve the equation x – 3 = 7. She subtracted 3 from both sides. What should she have done differently?

yawa3891 [41]

She should have added 3 instead of subtracting because u need to do inverse operation when solving equations.

4 0

3 years ago

Read 2 more answers

Simplify the following expression by combining like terms: 8z2 − 3z − 5z2 − 4z

Mariulka [41]

Answer:3z2-7z

Step-by-step explanation: First, subtract the 5z2 from the 8z2. Then, combine the last two like terms which are -3z and -4z.