Arandom variable x follows the uniform distribution with a lower limit of 720 and an upper limit of 920. a. calculate the mean and the standard deviation for the distribution. (round intermediate calculation for standard deviation to 4 decimal places and final answer to 2 decimal places.) b. what is the probability that x is less than 870?

a. mean = 820; standard deviation = 57.74

b.0.75 or 75%

Step-by-step explanation:

Lower limit (L) = 720

Upper limit (U) =920

a.The mean of an uniform distribution is given by:

The standard deviation of an uniform distribution is given by:

b. The probaility that X is less 870 is:

the answer is b i just did that

step-by-step explanation:

b) 1/3 * 1/5

step-by-step explanation:

each smallest part is 1/15 since the written one is 1/5 and it's divided by 3 equal parts. (1/5 )/3 = 1/15 = 1/3 * 1/5