Answer:
Mean=50.
standard deviation=50.
Step-by-step explanation:
Let the perfect score be 100.
The mean(average) of a data is given by: 
Here the number of data points are 100. out of which 50 attains a value 100,and 50 attains value 0.
so, sum of data points=50×100+50×0=5000.
Mean=50.
"Now the standard deviation of data points are calculated by firstly subtracting mean from every entry and then square the number and take it as new entry and calculate the mean of the new data entry and lastly taking the square root of this new mean".
Here if 50 is subtracted from each entry the new entry will have 50 entries as '50' and 50 entries as '-50'.
next on squaring we will have all the 100 entries as '2500'.
now the mean of these entries is: 
=2500
taking it's squareroot we have 
Hence, standard deviation=50.
Answer:
slope = - 
Step-by-step explanation:
The equation of a line in point- slope form is
y - b = m(x - a)
where m is the slope and (a, b) a point on the line
y - 3 = - (x - 2) ← is in point- slope form
with slope m = -
Answer:
a. The ratio of A to B is 2.92 : 1
b. The ratio of B to A is 1 : 2.92
c. A is 292% of B
Step-by-step explanation:
A = 52193
B = 17878
a. The ratio of A to B is: 52193 : 17878
To get the ratio in lower form, divide A with B (since it is the smallest of the two value) and the result is:
2.92 : 1
b. The ratio of B to A is: 17878 : 52193
1 : 2.92
c. The percentage of A to B is:
10 mean 100%
x mean 7%
--------------------
x=7*10/100 = 70/100 = 0,7
hope this helped
Answer:
The laptop was 934 dollars.
Step-by-step explanation:
The equation you should use to solve this is 120 + 11 (74) since the down payment was a one-time thing and she pays 74 dollars for 11 months, not including the first month.
When you solve that, you will get 934 which is the correct answer.
