
You don't multiply both of them, it's a coordinate function. There's suppose to be a comma in between
Answer:
b=ra-2x
Step-by-step explanation:
You solve for b by simplifying both sides of the equation then isolating the variable.
The probability that the first success occurs on the third trial is 0.125.
Answer: Option C
<u>Step-by-step explanation:</u>
The probability of success is given by the geometric distribution formula:

Where,
p = probability of success for single trial.
q = probability of failure for a single trial (1-p)
x = the number of failures before a success.
P(X = x) = Probability of x successes in n trials.
<u>Given:
</u>
p = 19% = 0.19
q = 1 – p = 1 – 0.19 = 0.81
x = 3
We want to find the probability that the first success occurs on the third trial so,



The fractions of the class is 1/4 because 1/4+1/5=2/5 and 2/5 of the class is in band.