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Rolinda’s first five Spanish test scores are 85, 85, 60, 62, and 59.
a. Find the mean, the median, and the mode of Rolinda’s Spanish test scores. Round your answers to the nearest tenth, if necessary.
b. Which of these measures best supports Rolinda’s claim that she is doing well in her Spanish class?
c. Why is Rolinda’s claim misleading?
a.
Mean:
To find the mean, we need to sum all the test scores and then divide by the number of scores.
85 + 85 + 60 + 62 + 59 = 351
Mean = 351 / 5 = 70.2
So, the mean of Rolinda’s Spanish test scores is 70.2.
Median:
To find the median, we need to arrange the scores in order from lowest to highest and then find the middle value.
59, 60, 62, 85, 85
Since we have an odd number of scores, the median is the middle score, which is 62.
So, the median of Rolinda’s Spanish test scores is 62.
Mode:
The mode is the most frequently occurring score.
In this case, there are two scores that occur most frequently, which are 85.
So, the mode of Rolinda’s Spanish test scores is 85.
b.
The best measure to support Rolinda’s claim that she is doing well in her Spanish class is the mean, because it takes into account all the scores and gives an average value.
c.
Rolinda’s claim is misleading because her scores are not consistent. They range from as high as 85 to as low as 59, which indicates that she may not be doing as well as she thinks. The mode being 85 and the median only being 62 suggest a skew in the data, with a few high scores bringing up the average.
A potato plant can reproduce asexually so that one potato can often give rise to many other potatoes. Strawberry plants can reproduce sexually. A potato plant puts a large amount of its energy into growing a tuber, which is the part that humans eat. The tuber can grow large and provide energy for the plant during the winter, or it can be used to grow new potato plants. A strawberry plant, on the other hand, puts much of its energy into growing flowers to attract insects that aid in pollination. After fertilization, the strawberry plant must then also grow seeds as well as fruit to attract animals that disperse the seeds. Based on this information, the asexually reproducing potato plant most likely devotes _______ to reproduction than the sexually reproducing strawberry plant.
a) more energy
b) fewer spores
c) less energy
d) more seeds
c) less energy
The Canadian lynx is a large wild cat that lives in the cold regions of Canada. The snowshoe hare is the main prey species that is hunted by the Canadian lynx. The snowshoe hare eats grass, fern, and leaves.If the population of Canadian lynx were to completely disappear, what would most likely happen to the food supply of the snowshoe hare?
a) The population of snowshoe hare would decrease, and there would be more food available.
b) The snowshoe hare would stop eating grass, so there would be less food available.
c) The snowshoe hare would start eating each other, so the food supply would not be affected.
d) The population of snowshoe hare would outgrow the food supply, so there would be less food available
a) The population of snowshoe hare would decrease, and there would be more food available.
If the Canadian lynx population completely disappears, the population of snowshoe hare would most likely increase, as there would be no predators hunting them. This would lead to a decrease in the food supply available to the snowshoe hare as the population would rise to exceed the carrying capacity of the environment.
An organism that contains two different alleles for a trait is said to be _______ for that trait.
a) recessive
b) heterozygous
c) dominant
d) homozygous
b) heterozygous.
Small differences between parents and offspring accumulate over time. This process
a) prevents parents from being able to care for their offspring.
b) makes it impossible for species to adapt to changes in their environment.
c) results in only one type of organism that has the exact same characteristics as its ancestors.
d) results in many different types of organisms with different characteristics from their ancestors.