A number cube is rolled 120 times. The number 4 comes up 47 times. What is the experimental probability of rolling a 4? What is
2 answers:
Answer:
<u>OPTION B </u>
B.
Step-by-step explanation:
A number cube is rolled 120 times; The number 4 comes up 47 times.
First, we have to determine the experimental probability of rolling a 4.
The formula to evaluate probability of an event is given; Probability =
Probability of rolling a 4; the total number of times when 4 appears/the total number of times number cube rolled=
We have to find the theoretical probability of rolling a 4.
Total number of outcomes number cube; 1,2,3,4,5,6
Probability of rolling a 4;
<u>OPTION B IS CORRECT</u>
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Answer:
a) 0.3125 per hour
b) 2.225 hours
c) 8.9 hours
d) 12.1 hours
e) 80%
Step-by-step explanation:
Given that:
mean time = 3.2 hours, standard deviation (σ) = 2 hours
The mean service rate in jobs per hour (λ) = 2 jobs/ 8 hour = 0.25 job/hour
a) The average number of jobs waiting for service (μ)= 1/ mean time = 1/ 3.2 = 0.3125 per hour
b) The average time a job waits before the welder can begin working on it (L) is given by:
c) The average number of hours between when a job is received and when it is completed (Wq) is given as:
d) The average number of hours between when a job is received and when it is completed (W) is given as:
e) Percentage of the time is Gubser's welder busy (P) is given as: