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Helen [10]
3 years ago
11

A sample of 12 measurements has a mean of 8.5 and a sample of 20 measurements has a mean of 7.5. Find the mean of all 32 measure

ments.
Mathematics
1 answer:
nalin [4]3 years ago
6 0
Multiply 8.5 by 12, multiply 7.5 by 20, add them together to get 252, then divide that by 32 to get 7.875. 7.875 is the mean of all 32 measurements
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The sales at Marty's Meat Market increased from $130,000 per month to $136,500. Determine the percent increase.
kicyunya [14]
Hello! For this question, we are looking for the percent of change. The formula for percent of change is change/original = x/100, where change is tge difference between two numbers, and the original is the previous number. 136,500 - 130,000 is 6,500. The original number is 130,000. It would be set up like this:

6,500/130,000 = x/100

Let's cross multiply the values. 6,500 * 100 is 650,000. 130,000 * x is 130,000x. That makes 650,000 = 130,000x. Now, divide each side by 130,000 to isolate the x. 130,000x/130,000 cancels out. 650,000/130,000 is 5. There. x = 5% increase. The answer is A: 5%.
8 0
4 years ago
A department store, on average, has a daily sales of $28,176.44. The standard deviation of sales is $1500. On Tuesday, the store
Solnce55 [7]

Answer:

You are t subtract both 28,176.44-$1500

Step-by-step explanation:

right after that the answer you get for subtraction you go ahead and use it to subtract with 34,083.30

7 0
3 years ago
Aaron is planning to attend a public university after he graduates from high school in 4 years. He is devising a plan to save mo
rjkz [21]

Answer:

b, 418.57

Step-by-step explanation:

subtract the total his family is contribution from tuition then divide by total months remaining

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6 0
3 years ago
Please help with this math question​
Sergio039 [100]

Answer:

t = 16/3

Step-by-step explanation:

4/3 : 7= 3t/4 :21

4/3 x 21 = 7 x 3t/4

28 = 21t/4

112 = 21t

t = 112/21 → t = 16/3

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3 years ago
Lawrence did some research on the ages of the female U.S. Olympic swimmers. He made a dot plot for the data. .. 17 18 19 20 21 2
kirza4 [7]

Answer:

21 years

Step-by-step explanation:

Lawrence did research on many different swimmers. He graphed each swimmer with a tick on the graph. The more ticks, the higher amount of people. <em>Because most of the ticks are on 21, If I did this right, It should be 21.</em>

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3 years ago
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