$\"\"$

The total number of times students floss their teeth is $\"\"$ .

The probability of the student $\"\"$ is $\"\"$ .

Similarlly $\"\"$ .

$\"\"$ .

The probability distribution of $\"\"$ is

\ \

\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

Flosses, $\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$
$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$

$\"\"$

Graph :

Graph the probability distribution.

$\"\"$

The mean value is $\"\"$ .

$\"\"$

$\"\"$ .

The mean value is $\"\"$ .

The students floss their teeth at an average of $\"\"$ days a week.

The variance of random variable $\"\"$ is $\"\"$ .

$\"\"$

The variance is $\"\"$ .

The standard deviation is $\"\"$ .

Substitute $\"\"$ .

$\"\"$ .

Therefore, the standard deviation is $\"\"$ .

$\"\"$

The probability distribution of $\"\"$ is

\ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \ \

Flosses, $\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$
$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$	$\"\"$

Graph of the probability distribution is.

$\"\"$

The mean value of a random variable $\"\"$ is $\"\"$ .

The students floss their teeth at an average of $\"\"$ days a week.

The variance of a random variable $\"\"$ is $\"\"$ .

The standard deviation of a random variable $\"\"$ is $\"\"$ .