Martin Penderis wrote: > Albert <[EMAIL PROTECTED]> wrote in message news:<[EMAIL PROTECTED]>... > > Q. There is a Chinese steel company that produces steel rods for local > > construction company. The plant manager knew from past statistics that the rods > > produced are normally distributed with a mean length of 300cm. The standard > > deviation is 8cm. If 22% of the sample means are more than specific length > > K, what is the value of K? > >[snip] > > > (1) Always make use of a sketch of the normal distribution for this > type of problem.
Amen! (sorry, that works best only with American Christians) YES!!!! Draw the picture! Always! If you can't figure out the picture, then you probably need to review the information that determines it. [more snip] Cheers, Jay -- Jay Warner Principal Scientist Warner Consulting, Inc. 4444 North Green Bay Road Racine, WI 53404-1216 USA Ph: (262) 634-9100 FAX: (262) 681-1133 email: [EMAIL PROTECTED] web: http://www.a2q.com The A2Q Method (tm) -- What do you want to improve today? . . ================================================================= Instructions for joining and leaving this list, remarks about the problem of INAPPROPRIATE MESSAGES, and archives are available at: . http://jse.stat.ncsu.edu/ . =================================================================
