GMAT · Quantitative Reasoning

Data analysis

7 practice questions, each with the answer and an explanation.

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Random questions from this topic, one at a time. You see the answer and the explanation straight after each one.

All 7 questions

The average of $4$ numbers is $26$ . When a new number, $41$ , is added, what is the new average?
The average of $5$ numbers is $20$ . When a new number, $32$ , is added, what is the new average?
The average of $5$ numbers is $14$ . When a new number, $32$ , is added, what is the new average?
The average of $4$ numbers is $16$ . When a new number, $36$ , is added, what is the new average?
In a group of $100$ people, $45$ read magazine A, $38$ read magazine B, and $30$ read magazine C. Also, $12$ read both A and B, $10$ read both B and C, $8$ read both A and C, and $4$ read all three. H…
The average score of $40$ students is $68$ . The boys averaged $64$ and the girls averaged $74$ . How many boys are there?
A fair coin is tossed $6$ times. Given that at least one toss is heads, what is the probability that at least $4$ tosses are heads?

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