Homework Help: Statistics

Posted by Statistics on Wednesday, September 23, 2009 at 8:16pm.

A density curve like an inverted letter "V" The first segment goes from the point (0, .6) to the point (0.5, 1.4). The second segment goes from (.05, 1.4) to (1, .6)

Find the percent of the observations that lie below .3

I have no idea how to do this If you could tell that would be great I got this

.3(.6) + 2^-1 .3 h = area
were h is the height of the triangle bit

.18 + .15 h = area

h is the height of the triangle part

also note that in other problems I was asked to find the median and stuff and check my answer in the back and it told me I was right the median is at .5

Statistics - Rosemary, Tuesday, September 29, 2009 at 10:59pm
The diameters of a wooden dowel produced by a new machine are normally distributed with a mean of 0.55 inches and a standard deviation of 0.01 inche. What percent of the dowels have a diameter greater than 0.57?

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