Table 4.26 shows the frequency distribution for the weight of 52 female workers in a factory.

Measurement have been recorded to the interest kilogram(kg)

Weight(Kg)
40-44	3
45-49	2
50-54	7
55-59	18
60-64	18
65-69	3
70-74	1

1. Construct a 'less than' ogive.
2. Find the number of students whose weights are greater than 61 kg.
3. If 25% of the students weight less than x kg , find x.