Correct answers only !
a student number system for a county requires that the student number be 5 characters. the first 3 characters are any single digit number, but no number can repeat and the last 2 characters must be letters, but no letter can repeat. how many unique student numbers are possible?
a. 1,370
b. 131,040
c. 250,000
d. 468,000

 D) 468,000

Step-by-step explanation:

1st character has 10 choices (numbers 0 - 9)

2nd character has 9 choice (numbers 0 - 9 excluding 1st number)

3rd character has 8 choices (numbers 0 - 9 excluding 1st & 2nd numbers)

4th character has 26 choices (A - Z)

5th character has 25 choices (A - Z excluding 4th character)

Multiply 1st & 2nd & 3rd & 4th & 5th characters

             10  ×   9   ×   8   ×  26 ×  25  = 468,000

the correct answer is b) histograms can be used to exhibit the shape of distributions. this is because histograms count the frequency of each possible answer, so one is able to see which results are more common and which are less common.

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step-by-step explanation: