the mean birth weight for children in a certain country at full term (after 40 weeks) is 3436 grams (about 7.6 pounds). suppose the standard deviation is 450 grams and the shape of the distribution is symmetric and unimodal.

Twenty-five percent of the customers entering a grocery store between 5 p. m. and 7 p. m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

The triangles in the diagram are congruent. if mzf = 40°, mza = 80°, and mzg = 60°, what is mzb?

Weekly wages at a certain factory are normally distributed with a mean of $400 and a standard deviation of $50. find the probability that a worker selected at random makes between $450 and $500