The following model shows the growth of a specimen by 1 hr. The length of the microbe grown in 1 hr is .
The following table shows data during a 1hr exam for a student.
Time during exam(mins) Total number of questions solved in the exam 0−10210−20520−301030−401540−501750−6025
The number of questions completed by the student in the last 10 minutes of the examination is ?