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crimeas [40]
3 years ago
5

Ninety-five percent of students at an elementary school are between 3.6 feet tall and 5.5 feet tall. Assume the height data at t

his school is normally distributed. Use the normal curve below and the empirical rule to find the mean and then the standard deviation for the height data. Round to two decimal places.
Mathematics
1 answer:
vazorg [7]3 years ago
3 0

Answer:4.55,0.47

Step-by-step explanation:

Given height varies from 3.6 feet to 5.5 feet for 95% student

i.e.

95% data falls in the interval of (\mu  -2\sigma ,\mu +2\sigma )

So

\mu -2\sigma=3.6-----------(1)

\mu +2\sigma=5.5 -----------(2)

Solving (1)&(2) we get

\mu =4.55

\sigma =0.475

Thus mean=4.55

And standard deviation=0.47

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If 30 is the total number of starbursts in a bag, how many starbursts are 70% of the bag?
daser333 [38]
Ten percent is 3 starburst because to find ten percent you divide the total number by ten. now to find 70 percent you times ten percent by seven. 3 x7 = 21 :)
8 0
2 years ago
Juans three math quizzes this week took him 1/3?4/6?and1/5 hour to complete. List all the fraction from least to greatest
Alex

Answer:

\frac{1}{5} ,  \frac{1}{3} , \frac{4}{6}.

Step-by-step explanation:

Given fractions \frac{1}{3}, \frac{4}{6}, \frac{1}{5}.

We need to list them from least to greatest.

In order to arrange them from least to greatest, we need to find the least common denominator of  \frac{1}{3}, \frac{4}{6}, \frac{1}{5}.

We have 3, 6 and 5 in denominators.

Least common multiple of 3, 6 and 5 is = 30, because 30 is least number that can be divided by all three number 3, 6 and 5.

Let us covert each denominator as 30.

Multiplying first fraction \frac{1}{3} by 10 in top and bottom, we get

\frac{1}{3} = \frac{1\times10}{3\times10}=\frac{10}{30}

Multiplying first fraction \frac{4}{6} by 5 in top and bottom, we get

\frac{4}{6} = \frac{4\times5}{6\times5}=\frac{20}{30}

Multiplying first fraction  \frac{1}{5} by 6 in top and bottom, we get

\frac{1}{5} = \frac{1\times6}{5\times6}=\frac{6}{30}.

Now, we can check \frac{10}{30}, \frac{20}{30} \ and \ \frac{6}{30}.

\frac{6}{30} is the smallest, \frac{10}{30} is greater and \frac{20}{30} is the greatest.

Therefore, we can arrange fractions\frac{6}{30}, \frac{10}{30} \ and \ \frac{20}{30}.

Writing original fractions in place of equivalent fractions, we can write

\frac{1}{5} ,  \frac{1}{3} and  \frac{4}{6}.

Therefore, the order the amounts of paint from least to greatest is:

\frac{1}{5} ,  \frac{1}{3} , \frac{4}{6}.




4 0
2 years ago
Can some one help me with this I need help with it it's due tomorrow so plz help me
Fynjy0 [20]
Add the two and you should get 2 and 7/16
7 0
3 years ago
Solve this 25 points
zloy xaker [14]
Y = 4 and x = 1 hope this helps!
8 0
2 years ago
Goran is riding his bicycle. He rides for 22.5 kilometers at a speed of 9 kilometers per hour. For how many hours does he ride?
astra-53 [7]

Answer: He rides for 2.5 hours or 2 and a half hours.

Step-by-step explanation:

He needs to complete a trajectory of 22.5 kilometers.

He rides 9 kilometers per hour.

Divide the total by the amount of kilometers that he rides.

\frac{22.5}{9}=2.5h

6 0
3 years ago
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