Cual es la sustitución de x/2+3=7

Anormally distributed data set has a mean of 176.3 and a standard deviation of 4.2. what is the approximate z-score for the data value of 167.9? 2.00 −2.00 8.4 −8.4

Afew weeks ago, vera bought 5 apples from her local farmers' market. today, she bought 4 apples. what is the percent of decrease in the number of apples bought?

Lisa dined at a restaurant and gave the waiter a 15% tip if the price of her meal was $10.25 how much did lisa tip the waiter