Answer:
The standard deviation of the data set is
.
Step-by-step explanation:
The Standard Deviation is a measure of how spread out numbers are. Its symbol is σ (the greek letter sigma)
To find the standard deviation of the following data set

we use the following formula

Step 1: Find the mean
.
The mean of a data set is the sum of the terms divided by the total number of terms. Using math notation we have:


Step 2: Create the below table.
Step 3: Find the sum of numbers in the last column to get.

Step 4: Calculate σ using the above formula.

Answer:
PQ:80
QR:160
PR:120
Step-by-step explanation:
∠
×
=
×
∠
×

×
∠
=
×
=
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Answer:
c
Step-by-step explanation:
4 times 5 is 20 and 20 times 6 is 120
Answer:
x=143/40
or
x=3.575
Step-by-step explanation:
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