In a
sample of 1000 cases, the means of a
certain test is 14 and standard deviation
is 2.5. Assuming the distribution to be
normal sind.
al how many students score between 12 and 15?
b) how many score above 18?
C) how many score below 8?
d) how many score 16?
Answers
Answered by
5
Answer:
Solutions:n = 1000, mean = 14 and standard deviation = 2.5Should say +0.4b. How many score above 18?1-.9452=.054799 * 1000 = 54.80c.
How many score below 18?.9452 = 945.20d.
What is probability that the test score is between 15 and 18?.9452-.6554=0.2898e.
The top 20% of the students will score how many points above the mean?=norminv(.80,14,2.5) = 16.10 or moreP-10
An investment service is currently recommending the purchase of shares of DollarDepartment Store selling at $18 per share.
The price is approximately normally distributed witha mean of 20 and a standard deviation of
Similar questions