Question

In Hillcrest School, 36% of middle school students are in Grade 6, 31% are in grade 7, and 33% are in grade 8. If a middle school student is selected randomly, what is the probability that the student is either in grade 6 or in grade 7? A) 0.31 B) 0.33 C) 0.64 D) 0.67

Answer 1

A student cannot belong to both Grade 6 and Grade 7, so the events are mutually exclusive. Using the addition rule for mutually exclusive events,

P(Grade 6 or Grade 7) = P(Grade 6) + P(Grade 7)

= 36% + 31% = 67% = 0.67

So the probability that the student is either in grade 6 or in grade 7 is D) 0.67%.

Answer 2

Answer:

0.64

Step-by-step explanation:

the explanation is in the picture

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