Answer:
2/3* 4/5 = 8/15
Step-by-step explanation:
I think your question is missed of key information, allow me to add in and hope it will fit the original one. Please have a look at the attached file below.
Given:
- One-fifth (1/5) of the playground is used for students to sit and read
- 2/3 is used for playing soccer
- The rest of the playground is used for playing basketball
So assume that the the playground is divided into 5 equal part
=> 1 part is used for students to sit and read or (1/5)
=> the remaining equal part is 4 or (4/5)
Because 2/3 of the remaining part is used for playing soccer
=> the equation represents the part of the playground used for soccer is:
2/3 of 4/5
= 2/3* 4/5
= 8/15
Answer:
a?
Step-by-step explanation:
Answer: 7 hr
Step-by-step explanation:
Given
Distance between Emily and Kylie is 
Speed of Emily 
Speed of Kylie 
Distance traveled by Emily 
Distance traveled by Kylie 
They will meet after 7 hour.
Answer:
x = - 20 / 3, y = 14 / 3
Step-by-step explanation:
In the picture
Answer:
C) H0:μd=0 and Ha:μd≠
0
Null hypothesis: 
Alternative hypothesis: 
Step-by-step explanation:
A paired t-test is used to compare two population means where you have two samples in which observations in one sample can be paired with observations in the other sample. For example if we have Before-and-after observations (This problem) we can use it.
Let put some notation
x=value for the first shop , y = value for the second shop
The system of hypothesis for this case are:
Null hypothesis: 
Alternative hypothesis: 
Or equivalently :
Null hypothesis:
Alternative hypothesis:
Since we define the difference 
and we obtain this:
The second step is calculate the mean difference
The third step would be calculate the standard deviation for the differences, and we got:
The 4 step is calculate the statistic given by :
The next step is calculate the degrees of freedom given by:
Now we can calculate the p value, since we have a two tailed test the p value is given by:
C) H0:μd=0 and Ha:μd≠
0
