The probability that a student uses Smarthinking Online Tutoring on a regular basis is 0.35 ....

The probability that a student uses Smarthinking Online Tutoring on a regular basis is 0.35 . In a group of 21 students, what is the probability that exactly 8 of them use Smarthinking Online Tutoring on a regular basis? Write only a number as your answer. Round to 4 decimal places (for example 0.2416). Do not write as a percentage.

Expert Solution

Answer:

P (student uses Smart thinking Online Tutoring on a regular basis) = 0.35

                           q = 1-p

                           = 1-0.35

                           =0.65

No of students n = 21

x=8

P (n, x) = nCx p^x (1 - p) ^ (n - x)

P (exactly 8 uses Smart thinking Online Tutoring)

= 21C8 * (0.35) ^8 * (0.65) ^13

= 0.1506 (using binomial distribution)

orchestra answered 1 year ago

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