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galina1969 [7]
3 years ago
10

Secθ= a. (sqrt tan^2 + 1) b. 1/sinθ c. (sqrt cos^2 + 1)

Mathematics
1 answer:
Dmitry_Shevchenko [17]3 years ago
6 0

Answer:

secθ=\sqrt{ \tan^{2} θ - 1 }

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According to the empirical (69-95-99.7) rule, if a random variable z has a standard normal distribution, then approximately 95%
Dmitry_Shevchenko [17]

Using z-scores, it is found that the value of z is z = 1.96.

-----------------------------

Normal Probability Distribution

Problems of normal distributions can be solved using the z-score formula, which for a measure X, in a distribution with mean \mu and standard deviation \sigma, is given by:  

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

  • It measures how many standard deviations the measure is from the mean.
  • Each z-score has an associated p-value, which is the percentile.

  • The normal distribution is symmetric, which means that the middle 95% is between the <u>2.5th percentile and the 97.5th percentile</u>.
  • The 2.5th percentile is Z with a p-value of 0.025, thus Z = -1.96.
  • The 97.5th percentile is Z with a p-value of 0.975, thus Z = 1.96.
  • Thus, the value of Z is 1.96.

A similar problem is given at brainly.com/question/16965597

7 0
2 years ago
What are two decimals that are equivalent to 7.7
Elza [17]
7.70 and 7.700 they are all the same since the 7 tenths are still in its place
8 0
3 years ago
Write 0.000739 in scientific notation.
jek_recluse [69]

Answer:

7.39 × 10-4^-4

Step-by-step explanation:

6 0
3 years ago
Read 2 more answers
Can someone help me please
malfutka [58]

Answer:

-2.5

Step-by-step explanation:

We need to find the slope using and two points

m = ( y2 -y2)/(x2-x1)

    = ( 25-20)/(-10 - -8)

    = 5/( -10+8)

   = 5/-2

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5 0
3 years ago
3×+2×^2-9Evaluate the expression below when x=9
Blizzard [7]

The answer is 180.

Hope that helped!

8 0
3 years ago
Read 2 more answers
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