The following table shows the probability of rolling the numbers 1 through 7 on a fair 7-sided die.
x 1 2 3 4 5 6 7
P(X) 1/71/71/71/7 1/7 | 1/7 | 1/7
What is the standard deviation of the random variable X, "the number that
comes up on the die"?

Lin is writing an equation to model the proportional relationship between y, the total cost in dollars of downloading videos from a website, and x, the number of videos downloaded. she knows that the total cost to download 3 videos was $12. her work to find the equation is shown below. joylin’s work step 1 k= 3/12= 0.25 step 2 y= 0.25x where did joylin make her first error?