Answer:disuxysidux
Step-by-step explanation:suussususu
This problem is a combination of the Poisson distribution and binomial distribution.
First, we need to find the probability of a single student sending less than 6 messages in a day, i.e.
P(X<6)=P(X=0)+P(X=1)+P(X=2)+P(X=3)+P(X=4)+P(X=5)
=0.006738+0.033690+0.084224+0.140374+0.175467+0.175467
= 0.615961
For ALL 20 students to send less than 6 messages, the probability is
P=C(20,20)*0.615961^20*(1-0.615961)^0
=6.18101*10^(-5) or approximately
=0.00006181
Answer:
(a)62.625 (b) 8.35
Step-by-step explanation:
33.4/4 = 8.35
8.35*7.5 = 62.625
Answer:
Option A
2:1
Step-by-step explanation:
The radius of circle B is half of that of A meaning circle A's circumference is twice that of B
Answer:
L = 13 m W = 11 m
Step-by-step explanation:
L = W + 2
area = L x W
143 = (W+2) * W
143 = W^2 + 2w
W^2 + 2W - 143 = 0
Use Quadratic Formula (a = 1 b = 2 c = - 143)
to find W = 11 m then L = 13
