¿Pueden calcular esto plis son los elementos ó parámetros faltantes de triángulos oblicuángulos. a = 15, c = 8, B = 20 ° a = 10, b = 5, B = 20 ° b = 13, c = 21, C = 100 ° b = 16, c = 9, B = 75 ° a = 18, c = 12, B = 15 °

In a certain city, the hourly wage of workers on temporary employment contracts is normally distributed. the mean is $15 and the standard deviation is $3. what percentage of temporary workers earn less than $12 per hour? a. 6% b. 16% c. 26% d. 36%