Answer:
the answer is 7.397 if im correct
Step-by-step explanation:
from the available data in this question,
1.
this population is applicable to those teenagers in the study who are aged 13 to 17 years and who own a smartphone
2.
from the question, this population is applicable to the the teenagers in the study within the age of 13 to 17 years who do not own a smartphone.
3. pew research conducted a sample survey and not a census to obtain their results. it would be illogical and not practical to conduct a census. A sample survey is better for this since it would cost less, save more time and also the members of the survey can easily be picked from the american teenage population.. a census would require data for the full population compared to sample survey which would only require a subgroup of the teenage population.
Answer:
The second graph
Step-by-step explanation:
I just took this
Answer:
x =
Step-by-step explanation:
Given,
Squaring on both L.H.S. and R.H.S.
By expanding L.H.S. we get x² + 49
By expanding R.H.S. we get x² + 10x + 25
x² + 49 = x² + 10x + 25
x² will be subtracted:
49 = 10x + 25
Variables are to be arranged:
10x = 49 - 25
10x = 24
x =
∴ x =
Answer:
68.27%.
Step-by-step explanation:
Here we have
Let X shows the SAT score. z-score for X=400 is
z-score for X=600 is
So the proportion of SAT scores falls between 400 and 600 is
hence, required percentage is 68.27%.
one can use the same method to find the% for all other cases as
well.