Answer:
±12.323
Step-by-step explanation:
A study by the department of education of a certain state was trying to determine the mean SAT scores of the graduating high school seniors. The study examined the scores of a random sample of 238 graduating seniors and found the mean score to be 493 with a standard deviation of 97. Calculate the margin of error using the given formula. How could the results of the survey be made more accurate?
The formula for margin of Error =
±z × Standard deviation/√n
We are not given the confidence interval but let us assume the confidence interval = 95%
Hence:
z score for 95% confidence interval = 1.96
Standard deviation = 97
n = random number of samples = 238
Margin of Error = ± 1.96 × 97/√238
Margin of Error = ±12.323
That is a rational number since you can write it as a ratio (=fraction).
Answer: D
Step-by-step explanation:
4r-r+3r can be simplified to just 6r
-s-2s-s can be simplified to just -4s
Answer: Priya enjoyed a 40% discount
Step-by-step explanation:
The key information in the question:-
*** The normal cost of a pair of earrings is $22
*** Priya eventually purchased the pair of earrings for only $13.20
*** We are required to calculate the percentage discount.
Discount generally refers to the reduction from the usual price of something. In this scenario, since Priya bought the pair of earrings for only $13.20 instead of the usual $22, the discount that Priya enjoyed =
$22.00 - $13.20
= $8.8
To calculate the percentage discount that Priya enjoyed, we divide the discount by the normal price and then multiply the result by 100
= (8.8/22) × 100
= (88/220) × 100
= 0.4 × 100
= 40%
Therefore, Priya enjoyed 40% discount on the price of the pair of earrings.
M = ounces of M&M
r = ounces of raisins
calories = 139m + 85r
calories < 600
139m+85r<600