Question

1.5, 2.5, 2.5, 4.1, 5, 6.7, 8.12, 9.9, 10.5, 10.4

Determine the mean and standard deviation

Answer 1

n= 10

$\mu=\frac{\sum}{n}$

$\mu=\frac{1.5+2.5+.....+10.4}{10}$

$\mu =6.122$

Std dev

$\sqrt{\sum_i^n\frac{(x_i-\bar x^2)}{n-1}}$

$\sqrt{\sum\frac{(1.5-6.122)^2+.....(10.4-6.122)^2)}{9}}$

=3.4804