Question

***URGENT*** TEST

1. At one large university, freshmen account for the 40% of the student body, if a group of 15 students is randomly chosen by the school newspaper to comment on textbook prices; what is the probability that at most three of the students are from freshmen? Round your answer to four decimal places (Use Binomial distribution to model this probability)

2.    The Test score in statistics of a class of students has a normal distribution with mean 65 and standard deviation 20. If a student in that class gets

40 marks in statistics, what is the corresponding z-score of the student’s mark. Round your answer to 2 decimal places.

4. Find the following probabilities: (Round your answer to four decimal places)

1. P(Z ≤ -1.5)                   b)   P(Z ≥ 0.25)                 c)   P(- 0.5 ≤ Z   ≤ 0.5) d)   P(Z ≤ -.45   0r Z ≥ 1.15

5. Assume that the distribution of weights of adult males is normal with a mean of 179.8 lbs. and a standard deviation of 45 lbs. Find the probability
    that a randomly selected adult male would have weight less than 170 lbs.   Round your answer to four decimal places.

Answer 1

Q1. There are to methods to solve this question. Although as per my understanding , you need to use 2nd method .
But I am providing you both the solutions.

Sorry , But I am legally bound to solve upto one question.
Please like the answer , Thanks!