Answer:
What do you mean?
Step-by-step explanation:
Total number of students - number of students who took 50 mins
120 - 116 = 4
Answer:
6.75
Step-by-step explanation:
Here we have to find the probability . Now express the probability in terms of standard normal cumulative distribution function. That is .
Now you can look up the probability from the standard normal tables. Its value is
Just write an equation on each one