What is Mean (325, 311, 311, 315, 307, 307, 310)?

The below workout with step by step work help grade school students or learners to understand how to find what is the mean or average for data set 325, 311, 311, 315, 307, 307 and 310 to measure or locate the center point of sample or population data which involved in the statistical survey or experiment, to draw conclusions of sample or population data characteristics.
Mean :
step 1 Address the formula, input parameters & values.
Formula:

µ = n ∑ i = 0 X_in
Input parameters & values
x₁ = 307; x₂ = 307, . . . . , x₇ = 325
number of elements n = 7
Find sample or population mean for 325, 311, 311, 315, 307, 307 & 310

step 2 Find the sum for dataset 325, 311, 311, 315, 307, 307 & 310

µ = n ∑ i = 0 X_in
= (307 + 307 + 310 + . . . . + 325)/7

step 3 Divide the sum by number of elements of sample or population
= 2186/7
= 312.2857
Mean (325, 311, 311, 315, 307, 307, 310) = 312.2857

312.2857 is the mean for dataset 325, 311, 311, 315, 307, 307 & 310 from which the standard deviation about to be measured to estimate the common variation of the sample or population dataset from its central location.

Median :
step 1 To find Median, arrange the data set values in ascending order
Data set in ascending order : 307, 307, 310, 311, 311, 315, 325

step 2Since the total number of elements in the dataset is 7 (ODD number), the 4^th element 311 is the median for the above data set.

Median = 311

Mode :
step 1 To find Mode, check for maximum repeated elements in the asending ordered dataset 307, 307, 310, 311, 311, 315, 325
Most repeated element : 307 & 311
Mode = 307 & 311