Question

this passage describes schooling time in guppies. guppies are small fish that may travel in organized groups called schools. the amount of time that a guppy stays in a school is called its schooling time. traveling in a school protects guppies from large fish. these fish must clearly see their prey to catch them. it is harder for these fish to see a single guppy when many guppies are together in a school. however, traveling in a school makes guppies easier for shrimp to catch. shrimp use smell to find their prey. large groups of fish are easier to smell, so it is easier for shrimp to catch guppies in schools. the table below describes a possible population of guppies at the start of a period of time and at the end of that period. the table shows schooling time measurements for a representative sample of the population at the start and for another representative sample at the end. complete the table. data from representative samples of a population of guppies point in time list of schooling time measurements (s) average schooling time (s) start 100.1, 104.1, 122.8, 132.0, 135.7, 141.3, 152.7, 162.5 end 199.9, 209.0, 214.8, 220.2, 227.9, 230.0, 249.4, 249.6

Explanation:

Step1: Sum start sample values

$100.1 + 104.1 + 122.8 + 132.0 + 135.7 + 141.3 + 152.7 + 162.5 = 1051.2$

Step2: Calculate start average

$\frac{1051.2}{8} = 131.4$

Step3: Sum end sample values

$199.9 + 209.0 + 214.8 + 220.2 + 227.9 + 230.0 + 249.4 + 249.6 = 1800.8$

Step4: Calculate end average

$\frac{1800.8}{8} = 225.1$

Answer:

Start average: $131.4$
End average: $225.1$