We simply divide the number of jars in each weight category by 100 to give the probabilities.

Weight X Number
of Jars
Probability
P(a X < b)
0.900 - 0.925 1 0.01
0.925 - 0.950 7 0.07
0.950 - 0.975 25 0.25
0.975 - 1.000 32 0.32
1.000 - 1.025 30 0.30
1.025 - 1.050 5 0.05
Total 100 1.00