30 students
14 have no siblings
that leaves 16 with siblings
6 have brothers and 12 have sisters which = 18 so 2 of the students have both a brother and a sister
2/30 students have a brother and a sister
1/15 chance
Step-by-step explanation:
please mark me as brainlist please
Answer:
1.5
Step-by-step explanation:

Answer:
each side is 31cm
Step-by-step explanation:
91/3=31
31+31+31=93

Explanation:
Since we have given that
The prices of three t-shirts styles i.e $24, $30, $36 with their probability is given by

As we know that,


Now,

and

So,

So, the expected value of a t-shirt = $31.