Question

The following distribution represents the IQ scores of 160 high school students

survey on the number of hours a college student works per week showed that the hours varied from 5

Classes (IQ scores) : Frequency

81-90 17

91-100 23

101-110 55

111- 120 46

121- 130 15

131- 140 4

Use the table to determine to answer the following questions. ( If answer is not possible write NA)

1. What percent of the students scored less than 101?

2. How many students scored at most 120?

3. How many students scored 115 or less?

4. What percent of the students scored exactly 125?

5. What percent of the scored at least 111?

Answer 1

From the given data

Class	Frequency
LL	UL	f
81	90	17
91	100	23
101	110	55
111	120	46
121	130	15
131	140	4
	Total =	160

As per the above table,

The percent of the students scored less than 101 is (17+23)/160 *100 = 25%

The number of students scored at most 120 is 17+23+55+46 = 141

The number of students scored 115 or less is NA

The percent of the students scored exactly 125 is NA

The percent of the scored at least 111 is (46+15+4) / 160 = 40.625%