I think the answer is b. cos(pi theta)= -0.6
1. The slope is -2/5 not 3-/10
Send the question?
Must click thanks and mark brainliest
The approximate middle value
Answer:
The standard deviation of X is 0.7
Step-by-step explanation:
We are given the following distribution:
x: 0 1 2 3
P(x): 0.3 0.5 0.2 0.4
We have to find the standard deviation of X.
Formula:

Thus, the standard deviation of X is 0.7