Suppose that the weights of 5400 registered female labrador retrievers in the united states are distributed normally with a mean of 62.5 lb and a standard deviation of 2.5 lb.
approximately how many of the labrador retrievers weigh less than 65 lb?

4543

Step-by-step explanation:

Given : The weights of 5400 registered female Labrador retrievers in the United States are distributed normally with a and a standard deviation of .

Using formula , the z-score corresponding to x= 65 will be :-

Using the z-value table , we have

i.e. Proportion of people weigh less than 65 lb= 0.8413

Now, the number of people weigh less than 65 lb =

Hence, the approximate number of people weigh less than 65 lb= 4543

what do you mean by fog

step-by-step explanation:

- "runner b is moving at a slower rate."

- "the graphs shown are graphs of distance(km) against time(min).

the slopes of this graphs are are given by:

slope = (change in y)/(change in x)

= (change in distance)/(change in time)

this is the formula for finding the speed. so, the slope of these graphs represent the speed of the runner.

taking each division in the graph to represent 1 on both axis:

runner a ⇒ speed = (2-0)/(1-0)

= 2/1

= 2 km/min

runner b ⇒ speed = (3-0)/(3-0)

= 3/3

= 1 km/min

this shows that   runner b is moving at a slower rate."