Answer:
Step-by-step explanation:
Given that a student takes a 20-question, multiple-choice exam with five choices for each question and guesses on each question.
Since each question has 5 choices p = probability for success = pr for getting correct guess = 0.2
Each question is independent of the other and q= pr for failure =1-0.2=0.8
Hence we have X, no of correct questions in the test is binomial n =20 and p =0.2
the probability of guessing at least 15 out of 20 correctly
=
<0.00001
So we can consider this event unlikely to occur because the probability is almost zero.
Answer:
3.5 and 5
Step-by-step explanation:
Given
f(x) =
To evaluate f(2) substitute x = 2 into f(x)
f(2) = = = 3.5
Similarly for (x)
(2 ) = = 5
Answer:
Perimeter = 20m
Area = 25m
If you want a good explanation please comment on this, I am at middle school and I have to go.
Step-by-step explanation:
Answer:
15:11 ,where 15 = 435
So, 11 = 435×11//15 = 29×11 = 319
Hence, No. of girls = 319