Severity: Warning

Message: count(): Parameter must be an array or an object that implements Countable

Filename: controllers/calculator.php

Line Number: 37

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numbers. This calculator is used to estimate a sample based on the data and measures the variation.A

sample of data form a population, then the standard deviation of the data can be calculated by using the

population standard measures.

Mean = (5+7+11+13+14) /5 = 50/5 = 10

then find the mean to get the result.

= (5-10) ^2 + (7-10) ^2+ (11-10) ^2+ (13-10) ^2+ (14-10) ^2

= (-5) ^2+ (-3) ^2+ (1) ^2+ (3) ^2+ (4) ^2

= 25 + 9 +1 +9 +16

=60

The Variance = 60/5 =12

√12 =3.46101615

=3.46 (Rounded to two decimal places)

Mean = (30+33+37+40)/4 =140/4=35

then find the mean to get the result.

= (30-35) ^2+ (33-35) ^2+ (37-35) ^2+ (40-35) ^2

= (-5) ^2+ (-2) ^2+ (2) ^2+ (5) ^2

=25+4+4+25

= 58

The Variance = 58/4 =14.5

√14.5 = 3.807886553

=3.81 (Rounded to nearest tenth).