Chapter 5, Problem 59PS

Social log-ins involve recommending of sharing an article that you read online. According to janrain, in the first quarter of $2017,45\%$ signed in via Facebook with $26\%$  for Google.

If a sample of $10$ social log-ins is selected, what is the probability that

a. more than 5 signed in using Facebook?

b. more than 5 signed in using Google?

c. none Singed in using Facebook?

d. What assumptions did you have to make to $\text{answer}\left(\text{a}\right)\text{through}\left(\text{c}\right)\text{?}$