Consider the dot plot which shows the distribution of data collected on the number of pets at home. which statement best describes the center of the data collected?

a.) The mean of the six layered plywood is 30 mm

    The standard deviation is 0.49 mm

b.) That the thickness is less than 28 mm has a probability of 0.000022.

Step-by-step explanation:

There are six layers in a plywood that is considered. It is also given that the layers are independent and normally distributed.

The thickness of the layers of the plywood have a mean, = 5 mm

and a standard deviation, = 0.2 mm.

a.) Therefore the mean of the six layered plywood is = 6

                                                                                   = 6 × 5 mmm

                                                                                   = 30 mm

 The standard deviation of the six layered plywood = = = 0.49 mm

b.) We are given to find that the probability of the plywood is less than 28 mm thick.

   P( thickness < 28 mm)

   P( Z < )       =  P(Z < )        ⇒       P( Z < -4.082) = 0.000022