La media de una población es 683.5g y su desviación estándar 52.1g. Determina la puntuación estándar para el valor 652.1

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000

Me because some of question i don’t understand

Boris needs to buy plastic spoons. brand a has a box 42 spoons for $2.37. brand b has a box of 72 spoons for $3.57. find the unit price for each brand. then state which brand is the better buy based on the unit price. round your answer to the nearest cent.