Kelsie works at a bicycle shop as a salesperson. she records the number of bicycles she sells daily. here is the probability distribution of b = the number of bicycles kelsie sells on a randomly selected day, and t the time she spends filling out daily sales reports. 2 b = # of bicycles sold t = time (minutes) probability 40 20 10 0.05 0.15 0.50 0.30

a) calculate e(b)
b) calculate the mean time she spends filling out daily reports.
c) calculate the standard deviation for both random variables.

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%

step-by-step explanation:

given that there are two triangles j'k'l' and jkl>

the former is got by dilating the second one.

when drawn on a grid, (graph paper) coordinates of vertices of first triangle is

(6,12)j, (9,6)k and (12,9)l

side jk has length = distance between j and k

=

side j'k'=distance between j' and k'

=

ie j'k'l' has sides 1/3 of that of corresponding sides of jkl.

hence scale factor of 1/3 is used to get j'k'l'from jkl

sorry i just need to anwers this to get points

step-by-step explanation:

kaahe btau