On a biased dice the probability of rolling a 1 is 0.3
the dice is rolled 150 times
how may ones do you expect to roll?

45.

Step-by-step explanation:

Expected number of 1's = probability of a 1 * number of rolls

= 0.3 * 150

= 45 .

18a

step-by-step explanation:

simply because it is. it's the highest common factor