91影视

Here is the probability distribution of Y.

Because the highest bar in the histogram is to the left, and there is a tail of smaller bars to its right, the distribution is skewed to the right.

Because there is only one peak in the histogram, the distribution is unimodal.

Because the highest bar in the histogram is centred at 0, the most common number of days working out is 0.

The number of days spent exercising ranges from 0 to 7.

As a result:

Rightward skewed

The most common number of days working out is unimodal 0

The number of days spent exercising ranges from 0 to 7.

The expected value (or mean) is calculated by multiplying each possibility y by its probability $p_i$

$$\begin{gathered} 渭=\underset{}{鈭�}{y}_i{p}_i \\ 渭==0x0.68+1x0.05+2x0.07+3x0.08+4x0.05+ \\ 5x0.04+6x0.01+7x0.02 \\ 渭=1.03 \end{gathered}$$

The average number of days spent working out is 1.03 days.