Helena has an 80% chance and Rodriquez has a 50% chance of obtaining 'A' grades in their History examination. Find the probability that: a both will obtain 'A' grades
b Rodriquez will get an 'A' and Helena will not
c. neither will obtain 'A' grades.
​

a) 0.40

b) 0.10

c) 0.60

Step-by-step explanation:

Helena has 80% chance of getting A ,

Rodriquez has 50% chance of getting A ,

a)

b)

Probability Rodriquez will get A and Helena will not

                                                            = 0.50 x 0.20 = 0.10

c) Probability neither will obtain A = 1 - Probability both will get A

                                                    = 1 - 0.40

                                                    = 0.60

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answer: graph 2

step-by-step explanation: