12th GRADE STATISTICS Reports claim 15.1% of adults are smokers, but Jane suspects the proportion of smokers has decreased since the numbers were taken. She takes a random sample of 200 adults and found 10.3% were smokers. The null hypothesis is p = 0.151 and the alternative hypothesis is p < 0.151

Which shows the correct work for checking that there are at least 10 expected successes?

A. 200(0.151)
B. 200(0.897)
C. 200(0.849)

with this answer, what would be the standard deviation of the sampling distribution?​