Amy swims the 50-m backstroke. When in competition, her mean time is 39.7 seconds. And the standard deviation is 2.3 seconds. If she needs to swim faster than 37 seconds to earn a medal, what is the probability that she earns a medal? (Hint - use your normal distribution chart)

And we can find this probability we can use this formula:

And using the normal standard distribution table or excel and we got:

Step-by-step explanation:

Let X the random variable that represent the time so complete the 50 m of a population, and for this case we know the distribution for X is given by:

Where and

We are interested on this probability

We can use the z score formula given by:

If we apply this formula to our probability we got this:

And we can find this probability we can use this formula:

And using the normal standard distribution table or excel and we got:

i would say the third one.

step-by-step explanation: liner would mean in a line and the only one that doesn't look like it's even thinking about forming a line would be the third one

answer: option a.

step-by-step explanation:

you know that the quadrilateral opqr ( a four sided figure) is inscribed in circle. this means that all its vertices are on the circle.

then, by definition, the opposite angles of the quadrilateral are supplementary, this means that the sum of their measures is 180 degrees.

you can observe in the figure that the angles ∠opq   and the angle ∠orq   are opposite, therefore:

then, can be used to d to calculate the measure of ∠opq