Pedro dice que si un determinado número lo multiplica por -2 y le suma 5 obtiene como resultado un número dado. Lupe dice que si ese mismo número lo multiplica por -3 y le suma 7 unidades obtendrá el mismo número dado por Pedro. ¿Cuál es la ecuación que se obtiene en la situación anterior? a 2x + 5 = 3x + 7
b -2x + 5 = -3 x + 7
c 2x + 5 = -3x + 7
d 2x + 5 =3x + 7

Ametal rod is 2/5 meters long. it will be cut into pieces that are each 1/30 meters long. how many pieces will be made from the rod?

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

How can you find the mean absolute deviation (mad) for this set of data?