Question

class interval | frequency (count)7.5-7.6 | 37.3-7.4 | 9l2-u2 | 2l1-u1 | 15the bottom two class intervals have been \hidden\ (replaced by l - lower and u - upper for the bottom two class intervals).what should l1 represent in this table?a. 7.00b. 6.70c. 6.90d. 6.80

Explanation:

First, identify the class width of the given intervals: for 7.3-7.4, width is $7.4 - 7.3 = 0.1$, and for 7.5-7.6, width is also $7.6 - 7.5 = 0.1$. Class intervals are ordered from lowest to highest, so the interval above L1-U1 is L2-U2, and L2-U2 is below 7.3-7.4. The upper limit of L2-U2 must be 7.3, so L2-U2 is 7.2-7.3. Then L1-U1 is the next lower interval with width 0.1, so its lower limit L1 is $7.2 - 0.1 = 7.00$.

Answer:

a. 7.00