The frequency distribution below shows the grade distribution of students' first exam in a history class. Find the standard deviation of this distribution. Round your answers to one decimal place. F= Frequency, G=grade f=3 g 46-56
f=6 g 57-67
f=10g 68-78
f=7 g 79-89
f=4 g 90-100

e

step-by-step explanation:

an equation by definition has to have two or more variables (x and 2 in this case)

d. 24+-0.114

step-by-step explanation:

the question requires us to calculate the approximate 95% confidence interval for the mean number of ounces of ketchup per bottle in the sample given the following statistics;

sample mean = 24

standard deviation, σ = 0.4

sample size , n = 49

the confidence interval for a population mean is calculated using the formula;

sample mean ± z-score*(σ/sqrt(n))

the z-score associated with a 95% confidence interval, from the standard normal tables, is;

1.96

substituting these values into the formula;

24 ± 1.96*(0.4/7)

= 24 ± 0.112

from the alternatives given, choice d is closest to the above expression;

step-by-step explanation:

for the free