STATISTICS.
The discrete random variable X has the probabilities:
X -2 0 2 4
P(X=x) a b a c
E(X)=2
1. Show that c=0 ,5
2. If Var(X)= 5,6 find the a and b.
Thank you.

step-by-step explanation:

the original amount doesn't ''re just looking for the time it takes for 1/2 of the substance to we have

(1/2) =)     take the ln   of both sides

ln (1/2)   = )   and we can write

ln(1/2) = ) lne     and lne   = 1     so we have

ln(1/2) = -.1092t     divide both sides by -.1092

t = ln(1/2)/-.1092 = about 6.347 days = about 6.3 days (rounded)

squares, rhombus, rectangles

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step-by-step explanation: