probability
posted by karen .
please help!
1.) A random digit from 1 to 9 (inclusive) is chosen, with all digits being equally likely. The probability that when it's squared it will end with the digit 1.
2.) A random number between 1 and 20 (inclusive) is chosen. The probability that its square root will not be an integer.

probability 
MathMate
1. Find how many (initial) digits when squared gives one. Dividing that by 9 will give you the required probability.
Also, it may be of interest to note that single digits that add up to 10 have the same last digits when squared.
Example: 2²=4 8²=(102)²=64 also ends with the digit 4.
2. Again, determine how many "perfect squares" there are among the numbers 1 to 20. Divide that number by 20 will give you the probability.
Respond to this Question
Similar Questions

stats please help test tom
When a computerized generator is used to generate random digits, the proability that any particular digit in the set {0,1,2, . . .,9} is generated on any individual trial is 1/100.1. suppose that we are generating digits one at a … 
Finite Math
Assume that 3 digits are selected at random from the set {1,3,5,6,7,9} and are arranged in random order. What is the probability that the resulting 3digit number is less than 700? 
Statistics and Probability
The TriState Pick 3 lottery game offers a choice of several bets. You choosea threedigit number. The lottery commision announces the winning threedigit number, chosen at random, at the end of each day. The "box" pays $83.33 if the … 
math
please help! 1.) A random digit from 1 to 9 (inclusive) is chosen, with all digits being equally likely. The probability that when it's squared it will end with the digit 1. 2.) A random number between 1 and 20 (inclusive) is chosen. … 
Math
I form a 3digit number at random from the digits 19. What is the probability that my number has no repeated digits? 
Probability please help!
The digits 2, 3, 4, 7, and 8 are each used once in a random order to form a fivedigit number. What is the probability that the resulting number is divisible by 4? 
Math
if the last digit of a weight measurement is equally likely to be any of the digits 0 through to 9.what is the probability that the last digit is greater than or equal to 5 ? 
Math
A number is chosen at random from among all 5digit numbers containing only the digits 1,2,3,4, and/or 5. Find the probability that the digits are all different. 
Math
In a table of random digits, each digit is to occur with a probability of 0.1. a) A student examines a list of 200 random digits and counts only eleven 4’s and thus claims that the table is not really random. Explain the error in … 
Math
A 3digit positive integer is selected at random. Find the probability that A) The last two digits of the number is 22 B) The number is greater than 900 C) The number is less than 100 D) The number contains at least one digit 8