29. the mean value of land and buildings per acre from a sample of farms is $1500, with a standard deviation of $200. the data set has a bell-shaped distribution. estimate the percent of farms whose land and building values per acre are between $1300 and $1700.

68.27%

Step-by-step explanation:

Given : Mean value of land and buildings per acre from a sample of farms :

The data set has a bell-shaped distribution. i.e. it follows Normal distribution.

Using , for x= 1300 , we have

For x= 1700 ,

Using standard normal z-value table,

P-value = P(-1<z<1)=  [Round to nearest 4 decimal places.]

i.e. The percent of farms whose land and building values per acre are between $1300 and $1700 = 68.27%

it is a. 4.2 because 7.6-3.4 gets the remaining length of 4.2. i might be wrong but i am pretty sure this is the answer.