Answer:
4.5 hour and 2 hour
Step-by-step explanation:
Given: The mean number of hours per day spent watching television, according to a national survey, is 3.5 hours, with a standard deviation of two hours.
To Find: If each time was increased by one hour, what would be the new mean and standard deviation.
Solution:
let the total numbers entries of hours in survey be = 
each entry in survey be = 
mean of survey is =
=

standard deviation is =
=

if each entry in survey is increased by one hour then,
each new entry in survey is = 
the new mean is
= 


+
=
+ 1=

now,
standard deviation is


putting values,

=
=2
new mean and standard deviation are
and

Answer: there were 345 pieces of chocolate in the box.
Step-by-step explanation:
Let x represent the number of pieces of chocolate there in the box.
0.55 of a box of chocolate are dark chocolate. This means that the number of dark chocolate in the box is 0.55x
0.3 are milk chocolate. This means that the number of milk chocolate in the box is 0.3x
The rest are white chocolate. This means that the number of white chocolate in the box is x(1 - 0.55 - 0.3) = 0.15x
There are 138 pieces more dark chocolate than white chocolate. This means that
0.55x - 0.15x = 138
0.4x = 138
x = 138/0.4
x = 345
Answer: X=5
Step-by-step explanation:
-8=(X+11)/-2
* start by multiplying both sides by -2
16=X+11
*subtract 11 from both sides
5=X
Hey!!
here is your answer >>>
Let's take the total amount as 'X'
Then,
(40/100)X = 24
2x /5 = 24
x = (24*5)/2
x = 12*5
x = 60!.
100% is 60
Hope my answer helps!
Answer:
y= -5x +7
Step-by-step explanation:
We can see points on the graph:
The function in general form is:
Let's find the slope and y-intercept as per identified points on the graph:
b= y- mx
- b= - 3 -(-5)*2= -3 +10= 7
Based on the found values of m and b, the given line is: