How many 3-digit numbers ending with a 5 can be formed using the digits 1,2,4,5,
ID: 3322575 • Letter: H
Question
How many 3-digit numbers ending with a 5 can be formed using the digits 1,2,4,5,6 and 9 if
repetitions are NOT allowed?
(A) 20 (B) 30 (C) 15 (D) 10
The age (in years) for a sample of 7 passengers on a bus are listed below. Find the standard
deviation of these ages.
19 48 18 33 49 28 23
The manager of an assembly process wants to determine if the number of defective products
is independent of the day of the week. From the summary results in the table below, find the
test statistic needed to test the manager's claim
Monday Tuesday Wednesday Thursday Friday Total
Nondefective 85 90 97 93 87 452
Defective 11 11 6 5 9 42
Total 96 101 103 98 96 494
(A) 4.319 (B) -1.212 (C) 7.449 (D) 8.099
Explanation / Answer
Solution:-
1)(A)The 3-digit numbers ending with a 5 can be formed using the digits 1,2,4,5,6 and 9 is 20
Total number of digits = 6
At units place we can have only one number i.e 5
Different ways of getting number on tens and hundred place = 5 × 4 = 20
The 3-digit numbers ending with a 5 can be formed using the digits 1,2,4,5,6 and 9 = 20
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