Assume that when adults with smartphones are randomly selected, 46% use them in meetings or classes. if 9 adult smartphone users are randomly selected, find the probability that at least 6 of them use their smartphones in meetings or classes.

0.18173219.

Step-by-step explanation:

We have been asked to find what will be the probability that at least 6 of 9 adults use their smartphones in meetings or classes.

We will find our answer using Bernoulli's trails.

First of all we will find the probabilities when r is 6, 7,8 and 9 then we will add them all.

When r=6,

Similarly we will find Probabilities when r=7, 8 and 9.

When r=7

When r=8

When r=9,

Now let us add all the probabilities to get the final answer.

Therefore, probability that at least 6 of 9 adults use their smartphones in meetings or classes is 0.18173219.

c - they will have the same distribution

step-by-step explanation:

this is the only one that could make sense. : )

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!