How can I calculate this through BA II Plus? I know how to do this in steps but it takes too much time. I am calculating the Expected Value, then the Variance and then the Std Dev through the square root.
Exercise is:
The probability distribution for a company’s sales is:
Probability** Sales ($ millions)** 0.05 70 0.70 40 0.25 25
Q. The standard deviation of sales is closest to:

9.82 million

12.20 million

32.40 million