Given that normally distributed data set has a mean of 55 and 99.7% of data fall between 47.5 and 62.5.
Let s be the standard deviation of data set.
Since 99.7% data fall within 3 standard deviations of mean, z-value for 47.5 and 62.5 has an absolute value of 3.
That is |z|=3
But z=
Let us plugin x=47.5 and mean =55 and equate it to 3.
That is
Since x is always positive ( being standard deviation),
Hence
We will get same value with 62.5 as well.
Hence standard deviation of data set is 2.5.
Answer:
<h2>
11 ¹/₉ yards</h2>
Step-by-step explanation:
You didn't say how many pieces. My answer is for 3 equal pieces.
For two it would be:
6/45 = 4/x
6x/45 = 4
6x = 180
x = 30
It would take 30 minutes
Keeping in mind that, the segment is split in three thirds, and the point is 2/3 of the way, so is closer to (9, -2), with a 2:1 ratio, check the picture below.