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2 years ago

Three friends sold candy bars to raise money for a school fundraiser.

Mathematics

2 answers:

icang [17]2 years ago

6 0

Answer:

Sandra sold 47

Samuel sold 23

Maria sold 92

Step-by-step explanation:

47-24 = 23

23 * 4 = 92

lawyer [7]2 years ago

5 0

Answer:

for the first one 5.75

for the second one 143

for the third one 53

for the foruth one 92

Step-by-step explanation:

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A study indicates that 37% of students have laptops. You randomly sample 30 students. Find the mean and the standard deviation o

Brilliant_brown [7]

Answer:

The mean and the standard deviation of the number of students with laptops are 1.11 and 0.836 respectively.

Step-by-step explanation:

Let X = number of students who have laptops.

The probability of a student having a laptop is, P (X) = p = 0.37.

A random sample of n = 30 students is selected.

The event of a student having a laptop is independent of the other students.

The random variable X follows a Binomial distribution with parameters n and p.

The mean and standard deviation of a binomial random variable X are:

$\mu=np\\\sigma=\sqrt{np(1-p)}$

Compute the mean of the random variable X as follows:

$\mu=np=30\times0.37=1.11$

The mean of the random variable X is 1.11.

Compute the standard deviation of the random variable X as follows:

$\sigma=\sqrt{np(1-p)}=\sqrt{30\times0.37\times(1-0.37)}=\sqrt{0.6993}=0.836$

The standard deviation of the random variable X is 0.836.

5 0

3 years ago

What are all the primes of 52

AleksandrR [38]

52 can be broken down to the following
2*26 =52
2*(2*13) <---13 x 2=26 x 2=52
2*2*13 or 2^2*13 <--BOTH mean the same thing :)

6 0

3 years ago

Isobel has 12 flowers. She wants to give an equal number of flowers to each of her 3 aunts. Which division problem could be used

NikAS [45]

The answer is 12 ÷ 3

Step-by-step explanation:

12 ÷ 3

7 0

3 years ago

Lucia draws a square and plots the center of the square. (image)

ss7ja [257]

Answer:

Step-by-step explanation:

Lucia's claim is correct since any rotation that is a multiple of 45° carries a square onto itself

8 0

2 years ago

At Silver Gym, membership is $35 per month, and personal training sessions are $30 each. At Fit Factor,

Vanyuwa [196]

Answer:

5 sessions each

Step-by-step explanation:

Let the personal training sessions be x.

Then at Silver Gym Sarah would spend:

35 + 30x

And at Fit Factor she would spend:

85 + 20x

Since total costs are same, the amounts will be equal:

35+30x = 85 + 20x
30x - 20x = 85 - 35
10 x = 50
x= 50/10
x= 5

So Sarah would buy 5 training sessions for each of the gyms.

And she would spend $185 at each.

3 0

2 years ago