Q. The probability that a contractor will get the plumbing contract is 2/3 and the probability that he will not get an electric contract is
5/9. If the probability of getting at least one contract is 4/5, what
is the probability that he will get both the contracts?

Can someone me out here number 4 plz

Select the two pairs of figures that are similar.

Scores on the cognitive scale of the bayley-scales of infant and toddler development range from 1 to 19, with a standard deviation of 3. calculate the margin of error in estimating the true mean cognitive scale score, with 99% confidence, if there are 12 infants and toddlers in a sample.