Una muestra de 16 niñas de 10 años pesan en promedio 71.5, con una desviación estándar de 12 libras. Considere el calculo de intervalos de confianza de 90,95 y 99 por ciento para Ia media (µ).

Usan threw a softball 42 yards on her first try and 5112 yards on her second try. how much farther did she throw the softball on her second try than her first? express your answer in feet and inches. 9 ft 12 in. 28 ft 12 in. 28 ft 6 in.