Binomial Distribution

Mozz

New Member
#1
"For a binomial distribution with p = 1/4 what is the probability that A will occur more than 18 times in a series of 48 trials?"

I used my TI 84 and came up with 0.01835...

My steps were: 2nd, vars, B: binomcdf (Trials 48, p .25, x value 18). I subtracted this from 1.

I also got 0.01835... using https://stattrek.com/online-calculator/binomial.aspx

Book says the answer is 0.0150

Any suggestions would be greatly appreciated.