In an exam, there is a problem that 60% of students know the correct answer. however, there is 15% chance that a student picked the wrong answer even if he/she knows the right answer. and there is also a 25% chance that a student does not know the right answer but guessed it correctly. a. what is the probability that a student knows the right answer and gets it right? b. what is the probability a student doesn’t know the right answer and gets it right?

percentage - 25%

probability - 0.25

we know,

total amount of students in class = 20

total boys = 10

total girls = 10

no of girls who wear glasses = 10/2 = 5

probability of choosing a girl with glasses is =

number of girls wearing glasses/total number of students in the class = 5/20

thus, percentage of selecting a girl wearing glasses will be

= 5/20 × 100

= 5 × 5

25%

therefore,

probability will be 0.25

happy to

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y < -3

step-by-step explanation:

-3y - 2 > 7

-3y -2 + 2 > 7+2

-3y > 9

-3y/-3 < 9/-3   (change the inequality sign when multiplying or dividing by a negative number)

y < -3