<span>Standard deviation is the square root of variance. Variance is always a non-negative number, since you can't take the square root of a negative number. So neither can be negative </span>
Answer:
80% of 75 = 60
Step-by-step explanation:
first make 80% a decimal so 0.8 because 80/100 = 0.8
the multiply 0.8 by 75
this will give you 60
Therefore Helen's necklace has 60 blue beads
