What single percentage change is equivalent to a 19% increase followed by a 7% decrease?​

On an airplane there are two seats on the left side and three seats on the right side there are 90 seats o the right side of the plane

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500

Idon't want to fail summer school. the probabilities of contamination in medicine capsules due to the presence of heavy metals and different types of microbes are given in the table. the probability of capsule b having microbial contamination is (the same as, greater than, less than) the probability of capsule d having it.