![abbz13](/avatars/8678.jpg)
abbz13
27.09.2021 •
Mathematics
Given that the average speed for the entire journey was 80km/h, form an equation in x and solve the equation.
total distance= 0.9x km
total time taken = 50 mins
Solved
Show answers
More tips
- F Food and Cooking How to Make Delicious Cabbage Pies: The Best Recipes!...
- S Science and Technology The Metric System in Our Daily Life: Understanding Its Importance...
- H Health and Medicine Angina: Causes, Symptoms, and Treatment...
- C Computers and Internet How to Learn to Type Fast?...
- F Food and Cooking Delight for Gourmets: How to Prepare Liver Pate...
- S Style and Beauty How to braid friendship bracelets?...
- H Health and Medicine Mercury Thermometer Danger: What to do when a thermometer breaks?...
- F Food and Cooking Which Calamari Salad is the Most Delicious?...
- S Society and Politics 10 Tips for Boosting Your Self-Esteem...
- F Food and Cooking The Most Delicious and Simple Fish in Batter Recipe...
Answers on questions: Mathematics
- M Mathematics I need help with this please...
- M Mathematics The problem calls to write the direct variation for equation that relates to x and y. And then find the value of Y. y=13.2x+1.35 (the one i need help with)...
- M Mathematics 10. The width of a rectangle is doubled and the length is halved. This produces a square with perimeter of Pem. What is the perimeter (in cm) of the original rectangle?...
- M Mathematics A delivery company claims that they deliver their packages in 2 days on average. You have been tasked with verifying their claim by another delivery company. You...
- M Mathematics What is the slope of the graph 0f 5x-2y=20...
- M Mathematics Ray QS bisects angle PQR , m angle PQS=5y-1 and m angle PQR=8y+12 Find m angle PQS accurate to three decimals...
- M Mathematics Steam and leaf plot question...
- M Mathematics Watermelon $5.69 each Pineapple $4.98 each Mango $1.09 each Jordan has $30.00 to spend. What combination of watermelon, pineapple, and mango can Jordan buy for $30.00?...
- M Mathematics Emily has x amounts of apples, Peter has 4 apples less than Emily and Joshua has 2 times the number of apples of Peter. The total amount of apples is 40. Find how...
- M Mathematics Lenovo 6. A student ran a distance of 2 miles each day for 5 days. Then the student ran a distance of 4 % miles each day for the next 3 days. What was the total...
Ответ:
Her area of study is too narrow. There are other sources of water in the city that she is not considering. So her sample is too biased leaning toward the Uncle's pond water, and that leaves out every other source. We say that the Uncle's source of water is over-represented while the other sources are completely under-represented.
Let's put it this way: We have a hypothetical city that has 100 acres of pond water either in or surrounding the city limits. If the Uncle's pond only represents 1% of this, then she's ignoring the other 99% of the ponds.
What Lila needs to do to to fix this error is to draw up a map of each major pond and mark those ponds with numbers 001,002,...998,999. In this example, there are 999 ponds. Then she needs to either use a random number table or computer software to help randomly generate values to help select the ponds. Doing so will ensure that she spans a good portion of the city and not stay focused on just the narrow area of her Uncle's backyard.
The reason why she needs to enlarge her area of study is because the results of her Uncle's pond study may lead to the wrong conclusion of the city overall. Let's say his pond is contaminated somehow, and it's only his pond that's the unfortunate one. She would likely see the pond is contaminated and conclude that the whole city's water is ruined as well, which isn't the case. Or we could have nearly the entire city's pond water in trouble, but her Uncle's pond is one of the lucky ponds not to get contaminated. We can see that Lila would likely conclude that no action needs to be taken to clean up the city's water sources, which is also not the case.
If Lila only cared about her Uncle's pond, then that pond (and perhaps immediate close surrounding area) would be her population of study. However, her study is about citywide pond water which is why she needs to extend to other places in the city or in the outer surrounding areas.