A garden contains 20 different species of plants. Five of these plants are ferns. What percent of the garden is made up if ferns
2 answers:
Answer:
25%
Step-by-step explanation:
A garden contains 20 different species of plants. Five of these plants are ferns.
Total number of species = 20
In that 20 species , 5 are ferns
WE need to find out how much percentage of 20 is 5
LEts make an equation. x be the percentage
x% of 20 is 5
Now multiply both sides by 5
x= 25
So 25% of 20 species plans is equal to 5 ferns
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Using the normal distribution, it is found that 0.26% of the items will either weigh less than 87 grams or more than 93 grams.
In a <em>normal distribution</em> with mean and standard deviation
, the z-score of a measure X is given by:
- It measures how many standard deviations the measure is from the mean.
- After finding the z-score, we look at the z-score table and find the p-value associated with this z-score, which is the percentile of X.
In this problem:
- The mean is of 90 grams, hence
.
- The standard deviation is of 1 gram, hence
.
We want to find the probability of an item <u>differing more than 3 grams from the mean</u>, hence:
The probability is P(|Z| > 3), which is 2 multiplied by the p-value of Z = -3.
- Looking at the z-table, Z = -3 has a p-value of 0.0013.
2 x 0.0013 = 0.0026
0.0026 x 100% = 0.26%
0.26% of the items will either weigh less than 87 grams or more than 93 grams.
For more on the normal distribution, you can check brainly.com/question/24663213