A shipment of beach balls with a mean diameter of 28 cm and a standard deviation of 1.3 cm is normally distributed. By how many standard deviations does a beach ball with a diameter of 31.9 cm differ from the mean?

A.) 1

B.) 1.3

C.) 2

D.) 3

Find - 1 1/5 + (-3/5). Write your answer as a fraction in simplest form.

Which expression is equivalent to - 1/4x + 1/2? -1/4 (-x + 1/2) 1/4 (-x + 1/2) -1/4 (x + 2) 1/4 (-x + 2)

Can anyone simplify? - (2z + 3w - 5t) + 6 (4z - 8w + 2t)

All seasons plumbing has two service trucks that frequently need repair. if the probability the first truck is available is. 74, the probability the second truck is available is. 57, and the probability that both trucks are available is. 46:

X - (-12) = 2 X = Answer here

A theater seats 496 people. Of all 8 performances to a play sell out, how many people will see the play?

What is the least common denominator of the fractions

Jack bought 4 dozen eggs at $10 per dozen. 6 were broken. what percent of his money goes to waste

6-9x^2=-750 solve for x

The theoretical probability of flipping heads on a coin is 1/2. is the probability of flipping heads likely, unlikely or neither?