OpenStudy (anonymous):

2 more problems and ill be done plz help!!!! the mean value of land and buildings per acre from a sample of 75 farms is $1500, with a standard deviation of $200. the data set has a normal distribution. estimate the number of farms whose land and building values per acre are between $1100 and $1900. round to the nearest whole number as needed.

5 years ago
OpenStudy (anonymous):

1100 is 2 standard deviations below the mean, 1900 2 stdev above. This means that approximately 95.4% of all sampled data falls within this range. 95.4% of 75 is 71.55; but obviously you can't have '0.55' of a farm, so I'd likely round to 72.

5 years ago
OpenStudy (anonymous):

it said its the wrong answer :(

5 years ago
OpenStudy (anonymous):

Then try 71?

5 years ago
OpenStudy (dumbcow):

its definitely 71 or 72

5 years ago
OpenStudy (anonymous):

its 71 thank u so much!

5 years ago
OpenStudy (anonymous):

Cool =)

5 years ago
OpenStudy (anonymous):

what does a normal distribution mean? having discrete data?

5 years ago
OpenStudy (anonymous):

how were you able to give a solid figure of 95.4%? thank you

5 years ago
OpenStudy (anonymous):

Look up the normal distrubition and standard deviation, salini. The "bell-curve fit" shows how the data lies, and that 95.4% of it lies within two standard deviations of the mean. It's a common method used in statistics.

5 years ago