Given
75% of grapefruit crop is good , p = 0.75
25% have rotten , q = 0.25
n = 10
Find
a) Probability of getting atleast 9 good grapefruit in a sack.
b) how many can you expect to be good in a sack.
Step-by-step explanation
a) Probability of getting atleast 9 good grapefruit in a sack =

b) expected number of grapefruit to be good =

Final Answer
Hence ,
a) Probability of getting atleast 9 good grapefruit in a sack is 24.4%
b) expected number of grapefruit to be good is 7.5