A nurse measured the blood pressure of each person who visited her clinic. To the right is a relative-frequency
histogram for the systolic blood pressure readings for those people aged between 25 and 40. The blood
pressure readings were given to the nearest whole number. Identify the center of the third class.
OA. 125
OB. 130
OC. 120
OD. 124

The sum of the class interval is divided by 2.
The intervals of a class on an histogram is the reading on the left and right leg of each bar.
For the third class, the interval is the values on the legs of the third bar.
The values are : (120 - 130)
The center of the class is calculated thus :
(120 + 130) / 2 = 250 /2 = 125

Hence, the center of the third class is 125.

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okpalawalter8 okpalawalter8 · Answer 2 · 2021-09-15T02:20:27+02:00

We have that the center of the third class is

X=125

Option A

From the Histogram we are told that

The Third class lies between 120 and 130.

Generally the equation for the center of the third class is mathematically given as

Average of the Range(X)=\frac{120+130}{2}

X=125

Therefore

The correct option is

Option A

In conclusion

On Determining the range of the Third class to be between 120 and 130 we find the average of the class range

Hence the the center of the third class.

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