There are 200 students in the 7th grade class at Brookside Middle School. Of these students, 12% play volleyball and 15% play ba
2 answers:
Answer:
Option B
Step-by-step explanation:
Given that there are 200 students in 7th grade
Volley ball players = 12% = 24
Baseball players = 15% = 30
Both players = 4
We have to find out the probability that a student plays either volley ball or baseball
No of students who play either base ball or volley ball =
24+30-4= 50
Probability that student plays either volleyball or baseball
=
In percent this equals 25%
Option b
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Answer:
c. 2
Step-by-step explanation:
Given : X = No. of hours worked
No. of people work for the manager = 50
X = 3, 4 , 5 , 6 , 7, 8
P(X) = 0.1 , ? , 0.14 , 0.3 , 0.36 , 0.06
To Find : No. of people work for four hours
Solution : First understand the fact that sum of all probabilities is equal to 1
So, sum of all values of P(X) = 1
⇒
⇒
⇒
⇒
So, the probability of no. of people worked for 4 hours is 0.04.
⇒P(4)=0.04
Thus , To calculate no. of people work for four hours :
⇒ 2 no. of people work for four hours per shift .