when ryan runs the 400 m dash his finishing times are normally distributed with a mean of 75 seconds in your standard deviation of 0.5 seconds use in the empirical rule, determine the interval of times that represents the middle 68% of his finishing times in the 400 m race

step-by-step explanation:

you can add the two numbers and divide the result by 2. or you can find the gap between the two numbers and add half of this to the smaller number.

step-by-step explanation:

this can be solved first with pythagorean theorem, which tells us to square both legs of the triangle and sum it. this will be equal to the square of the hypotenuse.

the hypotenuse is the side "opposite" the 90 degree angle, which is x.

so we can write using pythagorean theorem,

simplifying:

to further simplify this radical, we need to use the property  

thus

m=11 hope this

step-by-step explanation: