Response: Ruben initially possessed 50 books before making any purchases.
Explanation in steps: Ruben's acquisition of 6 new books led to a 12% increase in his collection.
We aim to determine the quantity of books Ruben had prior to his recent purchases.
Let x represent the original count of books Ruben held before buying more.
Based on the provided data, we derive the following equation:
Consequently, the original number of books Ruben had before making additional purchases equals 50.
Answer:
a) 1.92
b) 3.25
c) 1.5
d) -5.23
Step-by-step explanation:
We are provided with the following in the question:
4, 7, -1, 1, 0, 5, -2, 2, -1, 6, 5, -3
a) mean change score
b) standard deviation for the population
where represents data points,
is the average, and n denotes the count of observations.
Sum of squared deviations = 126.92
c) median change score
Arranged data: -3, -2, -1, -1, 0, 1, 2, 4, 5, 5, 6, 7
Median equal to
d) change score that is 2.2 standard deviations lower than the mean.