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No.	Boys	Girls
1	13	10
2	14	16

Scores: Class Interval	Frequency (f)	Cumulative frequency (F)
95.5-100.5	2	40
90.5-95.5	2	38
85.5-90.5	4	36
80.5-85.5	7	32
75.5-80.5	11	25
70.5-75.5	3	14
65.5-70.5	5	11
60.5-65.5	4	6
55.5-60.5	2	2

From the data presented above, solve the following questions:

a. Define percentile and percentile rank.

b. Determine 48^th (P₄₈) and 58th Percentile (P₅₈).

c. Also, calculate percentile rank of 48^th and 58^th Percentile.

Define research. Elaborate on research design.

Errors in statistical decisions

Discuss various methods of probability sampling.

Quasi experimental design