10 % of students in a college class are left handed. A statistics instructor, looking at the class roll, observed that there are 15 students in his class. on the first day of class, what is the probability that he will find between 3 and 7 left handed students? Both numbers are included
Binomial distribution section 5.3

Question

10 % of students in a college class are left handed. A statistics instructor, looking at the class roll, observed that there are 15 students in his class. on the first day of class, what is the probability that he will find between 3 and 7 left handed students? Both numbers are included
Binomial distribution section 5.3

anonymous · Answer

this is going to be a drag

anonymous · Answer

i know n=15 and p=.1 but x (number of successes) i dont know what to put

anonymous · Answer

$$P(x=3)=\binom{15}{3}.1^3\times 0.9^{12}$$ just for the first one

anonymous · Answer

$$P(x=4)=\binom{15}{4}.1^4\times 0.9^{11}$$

anonymous · Answer

then $P(x=5)$ and $P(x=6)$ and $P(x=7)$ and then add them up 
your math teacher must hate you