50% will be heterozygous. 50% will be homozygous. 75% will have the same phenotype as their parents.
One of the many places that the students would be able to grow grass is a nutrient rich soil area.
Answer: genotypic ratio 2/4
Phenotypic ratio 4/4 is the same
Explanation: suppose RR is the dominant female and Rr is the heterozygous male. Then after the cross genetically 2 have RR and 2 have Rr ratio. But phenotypically all 4 are the same.
To get an average, you must add all of the numbers together, and divide that sum by the amount of numbers there are. There are 6 number, which is what we must divide by.

6.8g is the average for the set of measurements.