The sum of two numbers is 87. If twice the second number is subtracted from the larger number the result is 12. What are the two numbers?

Q: The sum of a two digit number and the number formed by interchanging the digit is 132. If 12 is…

A:

Q: If the sum of two consecutive odd numbers is 48, find the numbers.

A: Consider a number n which is an odd number. Then, the consecutive odd number is n+2. Sum of these…

Q: If 15, then 3x = 3. (А) 5 (D) 45 (C) 18 (B) 12 (E) 135

A: solving equation by multiplying both side by constant. multiplying constant doesn't change equality…

Q: Six times the sum of a number and eight is 30. Find the number.

A: Given: 6 times the sum of number and eight is 30 Let the number be x.

Q: sum of three numbers is 88 . The second number is 2 times the third. The first number is 8 less than…

A: Let the three numbers be 'x', 'y' and 'z'.The sum of 3 number is 88, i.e.x+y+z=88The second number…

Q: n instructor counts the final grade three times as much as regular tests and each quiz 1⁄2 as much…

A: Regular test numbers 65, 72, 86, 98, 80. Average regular test grade = (65+72+ 86+98+80)/5 = 80.2…

Q: the sum of twice a number and nine is 17 . find the number

A: Solution-  Given  Sum of twice a number and 9 is 17  Then number = ? Let the no. Is X now we can…

Q: If twice a number, added to 3 is divided by the number plus 7, the result is seven fourths. Find the…

A: Answer is 37 Detailed explanation given in Step 2

Inverse Normal Distribution

The method used for finding the corresponding z-critical value in a normal distribution using the known probability is said to be an inverse normal distribution. The inverse normal distribution is a continuous probability distribution with a family of two parameters.

Mean, Median, Mode

It is a descriptive summary of a data set. It can be defined by using some of the measures. The central tendencies do not provide information regarding individual data from the dataset. However, they give a summary of the data set. The central tendency or measure of central tendency is a central or typical value for a probability distribution.

Z-Scores

A z-score is a unit of measurement used in statistics to describe the position of a raw score in terms of its distance from the mean, measured with reference to standard deviation from the mean. Z-scores are useful in statistics because they allow comparison between two scores that belong to different normal distributions.