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omeli [17]
3 years ago
10

Which of the following statements are true?

Mathematics
2 answers:
scoray [572]3 years ago
6 0

Answer:

All diagonal matrices are square matrices.

The size of any square matrix is m x m, where m is a positive integer.

jolli1 [7]3 years ago
4 0

Answer:

B. All diagonal matrices are square matrices.

C. The size of any square matrix is m x m, where m is a positive integer.

Step-by-step explanation:

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Find the upper 20%of the weight?
meriva

Answer:

The upper 20% of the weighs are weights of at least X, which is X = 0.84\sigma + \mu, in which \sigma is the standard deviation of all weights and \mu is the mean.

Step-by-step explanation:

Normal Probability Distribution:

Problems of normal distributions can be solved using the z-score formula.

In a set with mean \mu and standard deviation \sigma, the z-score of a measure X is given by:

Z = \frac{X - \mu}{\sigma}

The Z-score 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. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X. Subtracting 1 by the p-value, we get the probability that the value of the measure is greater than X.

Upper 20% of weights:

The upper 20% of the weighs are weighs of at least X, which is found when Z has a p-value of 0.8. So X when Z = 0.84. Then

Z = \frac{X - \mu}{\sigma}

0.84 = \frac{X - \mu}{\sigma}

X = 0.84\sigma + \mu

The upper 20% of the weighs are weights of at least X, which is X = 0.84\sigma + \mu, in which \sigma is the standard deviation of all weights and \mu is the mean.

6 0
2 years ago
Mrs. Johnson informed her students that their exam will have at most 25 questions
ANTONII [103]

Answer:

HH and animals and I will be there at one point I was just wondering if you have any questions please feel free to contact me at any time and I will

5 0
3 years ago
If mark has 3 friends help him paint his garage it will take 60 minutes how long will it take if he has 4 friends help him
olga2289 [7]

Answer:

40 minutes

Step-by-step explanation:

hope this will help :)

4 0
3 years ago
Find the 25th of sequence 3,5,7,9,11
zubka84 [21]

Answer: The 25th term of the sequence is 75

Step-by-step explanation:

The given sequence depicts an arithmetic progression. The consecutive terms differ by a common difference. We will apply the formula for arithmetic progression.

Tn = a + (n-1)d

Tn = The value of the nth term of the arithmetic sequence.

a = first term of the sequence.

d = common difference (difference between a term and the consecutive term behind it)

n = number of terms in the sequence.

From the information given,

a = 3

d = 5-3 = 7-5 = 2

We want to look for the 25th term, T25

So n = 25

T25 = 3 + (25-1)2 = 3+ 24×2

T25 = 3 + 72 = 75

5 0
3 years ago
∠A and ∠B are complementary angles. The measure of ∠A=4x° and the measure of ∠B=50°. Find m∠A. * i dont understand can someone h
jolli1 [7]

Answer:

m>a is 40

Step-by-step explanation:

4x + 50 = 90

4x = 40

x = 10

10*4 = 40

M>A = 40

3 0
3 years ago
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