Suppose that IQ scores have a bell shaped distribution with a mean of 101 and a standard deviation of 12. Using the empirical rule what percentage of IQ scores or no more than 125?

And we want to find the percentage of no more than 125. We can use the z score formula given by:

And using the value given we got:

From the empirical rule we know that within two deviations we have 95% of the values and in the tails 5%.

So we want the percentage below 2 deviations above the mean and the percentage would be (100- 2.5)=97.5%.

Step-by-step explanation:

We know the following parameters:

And we want to find the percentage of no more than 125. We can use the z score formula given by:

And using the value given we got:

From the empirical rule we know that within two deviations we have 95% of the values and in the tails 5%.

So we want the percentage below 2 deviations above the mean and the percentage would be (100- 2.5)=97.5%.

center= (-2,0)

radius= sqrt2/2

step-by-step explanation:

a) one student is chosen from classroom a, then a student is chosen from classroom b.  

step-by-step explanation:

independent events are ones in which the probability of one event does not affect the probability of the second event.

one student is chosen from classroom a; this does not affect the chances of choosing a student from classroom b.   this makes these independent events.

when one card is chosen from a standard deck and then set aside before a second card is chosen, the probability of the second card being chosen changes.   this makes them dependent events.

when one student is chosen from classroom a and then a second student is chosen from classroom a, the probability of choosing the second student changes.   this makes them dependent events.

when a letter is chosen from the alphabet and then a second letter is chosen, the probability of choosing the second letter changes.   this makes them dependent events.