Question

use this chart to calculate biomass eaten. transfer the last column of your data chart to the second column below. then multiply that number times the third column - mass (g). then convert from g to kg. next, multiply the mass of prey (kg) with the annual food (kg) eat/kg of prey to get the biomass eaten in kg. add the two columns to get the two totals needed for part d.

prey	number eaten per year	mass (g)	mass of prey (g)	mass of prey (kg)	annual food (kg) eaten/kg of prey	biomass eaten (kg)
vole		28			10 kg
mole		55			7 kg
shrew	730	5	3,650	3.65	15 kg
rat		240			9 kg
bird		20			4 kg
	total				total

Explanation:

Step1: Calculate mass of prey in grams for vole, mole, rat and bird

For vole: Let the number eaten per year be $n_{vole}$. Assume $n_{vole}$ is not given in the provided filled - in data. Mass of prey in grams = $n_{vole}\times28$.
For mole: Let the number eaten per year be $n_{mole}$. Assume $n_{mole}$ is not given in the provided filled - in data. Mass of prey in grams = $n_{mole}\times55$.
For rat: Let the number eaten per year be $n_{rat}$. Assume $n_{rat}$ is not given in the provided filled - in data. Mass of prey in grams = $n_{rat}\times240$.
For bird: Let the number eaten per year be $n_{bird}$. Assume $n_{bird}$ is not given in the provided filled - in data. Mass of prey in grams = $n_{bird}\times20$.

Step2: Convert mass of prey from grams to kilograms

For each prey type, divide the mass in grams by 1000. For example, if the mass of vole in grams is $m_{vole - g}$, then mass of vole in kg, $m_{vole - kg}=\frac{m_{vole - g}}{1000}$.

Step3: Calculate biomass eaten for each prey type

For mouse: Biomass eaten = Mass of prey (kg) $\times$ Annual food (kg) eaten/kg of prey. Given mass of mouse prey is $98.55$ kg and annual food eaten/kg of prey is $5$ kg. So biomass eaten by mouse - related consumption = $98.55\times5 = 492.75$ kg.
For shrew: Given mass of shrew prey is $3.65$ kg and annual food eaten/kg of prey is $15$ kg. So biomass eaten by shrew - related consumption = $3.65\times15=54.75$ kg.
For vole: Let mass of vole prey in kg be $m_{vole - kg}$, biomass eaten = $m_{vole - kg}\times10$.
For mole: Let mass of mole prey in kg be $m_{mole - kg}$, biomass eaten = $m_{mole - kg}\times7$.
For rat: Let mass of rat prey in kg be $m_{rat - kg}$, biomass eaten = $m_{rat - kg}\times9$.
For bird: Let mass of bird prey in kg be $m_{bird - kg}$, biomass eaten = $m_{bird - kg}\times4$.

Step4: Calculate totals

Total mass of prey (kg) = Sum of mass of prey (kg) for all prey types.
Total biomass eaten (kg) = Sum of biomass eaten for all prey types.

Answer:

Since the number of voles, moles, rats and birds eaten per year are not given completely, we cannot calculate the exact totals. But for mouse, biomass eaten is $492.75$ kg and for shrew, it is $54.75$ kg.