Answer:
16.35
Step-by-step explanation:
Using an inverse normal distribution, we can calculate the z score given the percentile, which can then be used to find our value.
First, we can use an inverse normal distribution calculator to figure out that the z score given the 75th percentile is 0.674.
Next, we know that the z score is (observed value - mean) / standard deviation. We can plug our values in to get
Rounding, we get x = 16.35 as our answer
Answer:
The number of marbles Richard has 24 and John has 6.
Step-by-step explanation:
Richard has four times as many marbles as john.
If Richard have 18 to John they would have the same number.
Now, to find number of marbles each has.
Let the marbles of John be .
And the marbles of Richard be
According to question:
<em>Subtracting both sides by we get:</em>
<em>Dividing both sides by 3 we get:</em>
<u><em>Marbles of John</em></u><em> = </em>
<u><em>Marbles of Richard</em></u><em> = </em>
Therefore, the number of marbles Richard has 24 and John has 6.