Write and slice a real world problem represented with 240 is equal or greater to 2x

Mathematics

1 answer:

OverLord2011 [107]3 years ago

3 0

This would be 240>= 2x the less than sign makes an L

You might be interested in

What is the slope and the y-intercept of the line on the graph below?

ss7ja [257]

slope = change in y / change is x

slope = rise / run

change in y = -1 (goes down 1)

change is x = 4 (goes right 4)

slope = -1/4

y-intercept, when x = 0

y-intercept = 1 = (0,1)

5 0

3 years ago

Read 2 more answers

Grades on a standardized test are known to have a mean of 1000 for students in the US. The test is administered to 453 randomly

Mademuasel [1]

Answer:

a: 1003 < µ < 1023

b: See attached photo for answers

c: see below

d and e: See second attached photo

f: See below

Step-by-step explanation:

a. to find a confidence interval, first find the error with the formula,

E = Z(σ/√n) where Z is the value of the z-score that relates to the confidence level, σ is the standard deviation of the population (or of the sample if the population standard deviation isn't given), and n is the sample size

For this problem, E = 1.96(108/√453) = 9.95 = 10

Now add and subtract that value form the sample average...

x - E < µ < x + E becomes 1013 - 10 < µ 1013 + 10

simplifies to 1003 < µ < 1023

b. See attached photo for hypothesis test results...

c. H0: µ = 1013

Ha: µ > 1013 (claim)

They want to test if it's greater than their first attempt, so this claim becomes the alternate hypothesis. We're testing against their first attempt, that's why µ = 1013, not 1000

d and e. See second attached photo for hypothesis test results...

f. There is enough evidence to support the claim that the students second attempt was an improvement from their first attempt. They happened to take a 2 hour tutoring course between tests. This doesn't prove that the tutoring was effective thought. It very well might have been effective, but also, the students taking the test again means they've already seen the test and know what to expect, which could have also boosted their scores.