One question in a survey is as follows: “Do you use Facebook during office hours at least once a day

Question

One question in a survey is as follows:
“Do you use Facebook during office hours at least once a day? Yes or No?''
It is known that on average, $7$ out of $9$ staff members answered “yes” to the above question. For the random sample of $60$ staff members selected,

find the standard deviation of the number of staff members who answer “yes”,[1]
find the probability that the number of staff members who answer “yes” exceeds the mean,[3]
find the most probable number of staff members who answer “yes”,[2]

Accepted Answer

(i) $3.22$ (3 s.f.) (ii) $0.532$ (3 s.f.) (iii) $47$

2013 DHS P2 Q10

2013 DHS P2 Q10

Video Solution:

Solution:

Solution locked