Number of people 'n' -> 98, probability of 'n' people -> 0.1 = 98 * 0.1 = 9.8
Number of people 'n' -> 89, probability of 'n' people -> 0.4 = 89 * 0.4 = 35.6
2) next two terms: ....3a(2b)^2 + (2b)^3
= .... 12ab^2 + 8b^3
3) next two terms : ....3(3x)(5)^2 + (5)^3
= .... 225x + 125
4) P(X=4) = 6C4 * (0.30)^4 * (0.70)^2 = 0.06 to 2dp
5) P(x greater than or equal to 2) = 1 - P(X<2)
= 1 - [P(X=0) + P(X=1)]
= 1 - [4C0 * (0.25)^0 * (0.75)^4 + 4C1 * (0.25)^1 * (0.75)^3]
= 1 - 0.74
= 0.26 to 2dp