1. An investment pays $1000 three quarters of the time, and $0 the remaining time. Its expected value and variance respectively are
2. An investment will pay $2,000 half of the time and $1,400 half of the time. The standard deviation for this investment is:
3. An investment will pay $2000 a quarter of the time; $1,600 half of the time; and $1,400 a quarter of the time. The standard deviation of this asset is: