Answer:
The reason why standard deviation of the entire class is greater than standard deviation of males and females considered separately, is that mean values for males and females are different from each other.
Step-by-step explanation:
The concept of mean is well represented by the following formula
mean = , where x1, x2, xn are the observations and N is the number of observations (population).
Standard deviation represents the distance between each observation and the mean of the population (all observations). The formula for this parameter is:
Standard deviation =√[((x1 - x)² + (x2-x)² + ....+ (xn-x)²)/N-1], where x1, x2,..., xn are the observations and x is the mean value.
In this case you have that each height registered is an observation and the number of observations represents the N value. As you can see if the mean for males is different from that of females their standard deviation will be different too. Usually males have heigths greater than that of females (1.77 vs 1.64, in USA for example), and heights inside each group will be more similar than between groups. Then, when you mix all observation there will be an increase in standard deviation, because you are mixing very different heigths
Answer:
A. ZY=15
Step-by-step explanation:
Insufficient information is given about angles to make any statement about the value of p or the measures of any angles. (Eliminates B,C,D,E)
Side YZ corresponds to side FG. Since they are congruent, their measures are the same. This means ...
2n -5 = n +5
n = 10 . . . . . . . . add 5-n
YZ = ZY = 2·10 -5 = 15 . . . . . . matches choice A
Answer:
Step-by-step explanation:
We begin by solving for x in term of y
We can use the disk method to calculate the volume of rotation around the y axis
Where
Answer:
4<x<12
Step-by-step explanation:
8.0+4.0=12.0
8.0-4.0=4.0 or 4
The rules of triangles is that it must be less than the sum you had when you first added 8.0and 4.0 which was 12
So therefore , 4< x < 12
and I also got it right on khan academy lol