Studies show that 53 of babies born in the US are girls A ho

Studies show that 53% of babies born in the US are girls. A hospital keeps track of babies born their maternity ward. Use the normal approximation for the binomial distribution to find the probability that of the next 100 births more than 50 of the babies will be girls. The proportion of UNI students classified as a freshman Is 0.31. You interview 500 students. What is the probability that your sample proportion, p. for freshman is less than 0.33?

Solution

Q 6 proportion for girls p 0.53 n 100 mu np 53 Var npq 24.91 sigma 4.990992 P(X>50) P(Z> -0.60108 0.2709 Q7 p 0.31 var 0.000428 std error 0.020683 p is normal P(p<0.33) P(Z< 0.966962 0.166