¡¡URGENTE!! Necesito calcular espacio muestral Carlos, María, Pedro, Luisa y Andrés participan para escoger una pareja que represente al grupo en las olimpiadas. ¿Cuál es la probabilidad que María y Pedro queden de pareja? Calcular el espacio muestral.

In a class, there are 12 girls. if the ratio of boys to girls is 5: 4 how many boys are there in the class

The number of chocolate chips in a bag of chocolate chip cookies is approximately normally distributed with a mean of 12611261 chips and a standard deviation of 118118 chips. (a) determine the 2626th percentile for the number of chocolate chips in a bag. (b) determine the number of chocolate chips in a bag that make up the middle 9696% of bags. (c) what is the interquartile range of the number of chocolate chips in a bag of chocolate chip cookies?

Set $r$ is a set of rectangles such that (1) only the grid points shown here are used as vertices, (2) all sides are vertical or horizontal and (3) no two rectangles in the set are congruent. if $r$ contains the maximum possible number of rectangles given these conditions, what fraction of the rectangles in set $r$ are squares? express your answer as a common fraction.