Question 666297
Use the binomial distribution since you can either wear glasses or you don't wear glasses. Trials are independent since glasses on one doesn't effect the other.

P[x>=6] = P[x=6]+P[x=7]+P[x=8]+P[x=9]+P[x=10]

(10 choose 6) * (.70)^6 *(.30)^4 + (10 choose 7) * (.70)^7 * (.30)^3 + (10 choose 8) * (.70)^8 *(.30)^2 + (10 choose 9) * (.70)^9 * (.30)^1 + (10 choose 10) *(.70)^10 * (.30)^0 = .8497