The probability that an individual is left-handed is 0.16. In a class of 40 students, what is the mean (or expected value) and standard deviation of the number of left-handers in the class? A. mean: 40; standard deviation: 2.52982213
B. mean: 6.4; standard deviation: 2.52982213
C. mean: 6.4; standard deviation: 2.31862028
D. mean: 40; standard deviation: 2.31862028

C. mean: 6.4 and standard deviation: 2.31862028

Step-by-step explanation:

We are given

n=40

p=0.16

q= 1-p = 0.84

mean = np = 40*0.16 = 6.4

standard deviation =

                                =

                              sd = 2.31862028

(- 1, 0 )

step-by-step explanation:

an x- intercept is where the function crosses the x- axis.

to find the x- intercept/s look for the value of x when f(x) = 0

from the given table there are 3 values of x where f(x) = 0

when x = - 1, x = 2, x = 3

the one that is listed is (- 1, 0 )