Un amigo me mando 2 sellos para mi colección con un valor de 60 pesos cada uno yo le mande a cambio otros por un valor de 135 pesos cuánto dinero he gastado yo más que mi amigo?

In a survey of 1015 adults, a polling agency asked, "when you retire, do you think you will have enough money to live comfortably or not. of the 1015 surveyed, 534 stated that they were worried about having enough money to live comfortably in retirement. construct a 90% confidence interval for the proportion of adults who are worried about having enough money to live comfortably in retirement.