Question

1. a science class counted how many insects they observed in different regions: 12, 9, 7, 15, 11, 7, 8, 10, 7 find the: a) mean:

b) median:
c) mode:
d) range:

Explanation:

Step1: List the data

Data set: 12, 9, 7, 15, 11, 7, 8, 10, 7 (count = 9 values)

Step2: Calculate mean

Sum = 12+9+7+15+11+7+8+10+7 = 86
Mean = $\frac{86}{9} \approx 9.56$

Step3: Find median

Sorted data: 7,7,7,8,9,10,11,12,15
Median = 5th value = 9

Step4: Identify mode

Most frequent value: 7

Step5: Compute range

Range = Max - Min = 15 - 7 = 8

Answer:

a) 9.56
b) 9
c) 7
d) 8