Sophia spent 7.30 for school supplies. she spent 3.00 for a notebook and 1.75 for a pen. she also bought 3 large erasers. if each eraser had the same cost, how much did she spend for each eraser? plz hlep fast?

Use this data in the problem below. follow the steps carefully. round to the nearest tenth. lot 3: week 1: 345 week 2: 340 week 3: 400 week 4: 325 step 1. jim enters the data and calculates the average or mean. step 2. jim calculates the deviation from the mean by subtracting the mean from each value. step 3. jim squares each deviation to remove negative signs. step 4. jim sums the squares of each deviation and divides by the count for the variance. step 5. jim takes the square root of the variance to find the standard deviation.

Describe in detail how you would construct a 95% confidence interval for a set of 30 data points whose mean is 20 and population standard deviation is 3. be sure to show that you know the formula and how to plug into it. also, clearly state the margin of error.

5,600 x 10^3 = a) 560 b) 5,000,600 c) 5,600,000 d) 56,000