1. Given the following frequency distribution, compute for the following. Class Intervals frequency (f) 30 – 34 10 35 -39 14 40 – 44 26 45 – 49 35 50 – 54 23 55 – 59 19 60 – 64 15 65 – 69 6 70 - 74 4   Required: a. Range b. Quartile deviation c. Average deviation d. Standard deviation

Spacers are manufactured to the mean dimension and tolerance shown in Figure 29-12. An inspector measures 10 spacers and records the following thicknesses: 0.372" 0.376" 0.379" 0.375" 0.370" 0.373" 0.377" 0.378" 0.371" 0.380" Which spacers are defective (above the maximum limit or below the minimum limit)? All dimensions are in inches.

Find the mean hourly cost when the cell phone described above is used for 240 minutes.

Thirty AA batteries were tested to determine how long they would last. The results, to the nearest minute, were recorded as follows: Table 3: Life of AA batteries, in minutes Battery life, x (in minutes) Number of battery 360 - 369 2 370 - 379 3 380 - 389 390 - 399 7 400 - 409 410 - 419 4 420 - 429 430 - 439 Based on Table 3: (a) Draw a cumulative frequency curve (ogive) to represent the above data. [Use graph paper] (b) Find the semi inter-quartile range by using the cumulative frequency curve. (c) Estimate the percentage number of battery with the battery life between 400 and 430 minutes. (d) of battery life. Calculate the mean and standard deviation for the number LO 3.