the mean value of land and buildings per acre from a sample of farms is $1200 with standard deviation of $100.The data has a bell shaped distribution. Using the empircial rule, determaine which of the following farms, whose land and bulidng values per acre are given, are ususal (more than two standard devitations from the mean).Are any of the data values very unsusal (more than three standard deviations form the mean)? $1215 $1409 $1128 $863 $1283 $1035

d is the correct answer

step-by-step explanation:

x= 8 because 3x = 3 * 8, and 3*8 = 24

hello,

b) 62.47% of the students are between 14 and 18 years old.

step-by-step explanation:

mean = 15 and standard deviation = 2

student between 14 to 18

formula used z-score

for age 14 , z score

using z-table , p(z> -0.5)=0.3085

for age 18 , z score

using z-table , p(z< 1.5)=0.9332

p(-0.5< z< 1.5)=0.9332-0.3085 = 0.6247

thus, 62.47% of the students are between 14 and 18 years old.

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step-by-step explanation:

-3.5 degrees per hour

step-by-step explanation:

find the unit rate:

-12   1/4 degrees           12.25 degrees

= - = -3.5 degrees per hour

      3   1/2 hours               3.5 hours