Use the histogram and find the sum of the number of students studying for $4 - 5$ and $8 - 9$ hours.

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Solution

The correct option is A 8
From the histogram,
The number of students studying for $4 - 5$ $= 5$ .
The number of students studying for $6 - 7$ $= 4$ .
The number of students studying for $8 - 9$ $= 3$ .

Therefore, the sum of the number of students studying for $4 - 5$ and $8 - 9$ hours $= 5 + 3 = 8$ .

Hence, option $B$ is correct.

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Use the histogram and find the sum of the number of students studying for 4−5 and 8−9 hours.

The correct option is A 8From the histogram,The number of students studying for 4−5 =5.The number of students studying for 6−7 =4.The number of students studying for 8−9 =3.Therefore, the sum of the number of students studying for 4−5 and 8−9 hours =5+3=8.Hence, option B is correct.

Use the histogram and find the sum of the number of students studying for $4 - 5$ and $8 - 9$ hours.