# Activity- statistics problems

# Problem 1

If n =10, = 12 and

# INTERPRETATION OF PROBLEM

# Previous knowledge

# Solution

σ=

σ=

σ=

σ=

σ=3

From Karnataka Open Educational Resources

If n =10, = 12 and
$\sum {x^{2}}$

${\frac {\sum x}{n}}={\bar {x}}$

$\sum {x}={{\bar {x}}\times {n}}$

$\sum {x}={12\times {10}}$

$\sum {x}=120$

σ=${\sqrt {{\frac {\sum {x^{2}}}{n}}-({{\frac {\sum x}{n}})^{2}}}}$

σ=${\sqrt {{\frac {1530}{10}}-{144}}}$

σ=${\sqrt {153-144}}$

σ=${\sqrt {9}}$

σ=3