Kimberly K.

asked • 10/17/16

Statistics Question

Two-thirds of students have jobs to help with bills in college. If 20 students are surveyed what is the probability that half of the students will have jobs?

1 Expert Answer

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Kenneth S. answered • 10/17/16

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Binomial distribution:
P(10 jobs, 10 not) = 20C10(2/3)10(1/3)10
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Kimberly K.

Is there a function in my calculator I could use to solve this problem? Or is that the only way? Your way seems pretty easy but it's always good to know if there's other options. Thank you for your help! 
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10/17/16

Kenneth S.


Using the Binomial Distribution Commands (TI-83/84)

Commands for binomial distributions (Bernoulli Trials), p = PROBABILITY OF SUCCESS, n TRIALS:
• binompdf (n, p) to produce the entire list of probabilities, x from 0 to n
• binomcdf (n, p, k) to get the (cumulative) probability of any x value from 0 to k.
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10/17/16

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