Binomial Probability Conditions

Which condition is not needed for Binomial probability distribution:

• fixed number of trails

• two outcomes: success or failure

• probability of failure = 0.5

• probability of success = 40%

• the probability of success of each trial is the same

True or False:
exactly = binompdf
at most = binomcdf
at least = 1-binomcdf  

• True
• False

True or False:

When I see the word at least I must remember to reduce the number following at least by 1.

at least 4

1-binomcdf (10, 0.25, 3)

• True

• False

MC test with 4 choices per question.  Find probability of getting exactly 5 out of 12 questions correct.  Which of the following is used to find the probability?

• binompdf
• binomcdf
• 1−binomcdf
• 1-binompdf

MC test with 4 choices per question find probability of getting at most 5 out of 10 questions correct.  Which of the following would be used?

• binompdf
• binomcdf
• 1−binomcdf
• 1-binompdf

MC test with 4 choices per question, find the probability of getting exactly 7 out of 10 questions correct. Which of the following is the correct binomial?

• binompdf (10, 0.25, 7)
• binompdf (10, 0.70, 4)
• 1−binomcdf(10, 0.70, 7)
• 1-binompdf(10, 0.25, 7)

MC test with 4 choices per question find probability of getting at least 6 out of 10 questions correct

• 1-binompdf(10, 0.25, 7)
• 1-binomcdf (10, .25, 6)
• 1−binomcdf(10, 0.6, 4)
• 1- binomcdf (10, .25, 5)

In Vietnam, the probability of rain is 70%.  Find the probability of it raining at most 2 days in a week.

• .9712
• 0.0250
• .0287
• .2988

In Vietnam, the probability of rain is 70%.  Find the probability of it raining at most 5 days in a week.

• .9712
• .6705
• .3294
• .5520

If a standard die is rolled 8 times, find the probability of rolling a number 4 at least twice.

• .3953
• .9548
• .8554
• .2245