Question

A florist determines the probabilities for the number of flower arrangements they deliver each day.

x	19	20	21	22	23
P(x)	0.20	0.23	0.31	0.13	0.13

Find the mean, variance, and standard deviation of the distribution rounded to 4 decimal places.

Mean =

Variance =

Standard Deviation =

Approximately how many arrangements should the florist expect to deliver each week, rounded to the nearest whole number?

The distribution of scores on a recent test closely followed a Normal Distribution with a mean of 22 points and a standard deviation of 2 points. For this question, DO NOT apply the standard deviation rule.

(a) What proportion of the students scored at least 19 points on this test, rounded to five decimal places?

(b) What is the 42 percentile of the distribution of test scores, rounded to three decimal places?

Answer 1

Let me know in the comment section if anything is not clear. I will reply ASAP!

If you like the answer, please give a thumbs-up. This will be quite encouraging for me.Thank-you!