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mrs_skeptik [129]
3 years ago
9

The heights of a group of girls are normally distributed with a mean of 66 inches. If 95% of the heights of these girls are betw

een 63 and 69 inches, what is the standard deviation for this group.
Mathematics
1 answer:
alisha [4.7K]3 years ago
6 0

Answer:

The standard deviation is 1.5 inches.

Step-by-step explanation:

For a normal curve, we have that the area between the mean and the mean plus two times the standard deviation is something around 47.5%

Then the area between the mean minus two times the standard deviation and the mean plus two times the standard deviation is equal to the 95%.

the mean is 66

if the standard deviation is x, we have that:

66 + 2*x = 69

66 - 2*x = 63

then we can find that:

2*x = 66 - 63 = 3

x = 3/2 = 1.5

The standard deviation is 1.5 inches.

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An article in USA Today stated that Internal surveys paid for by directory assistance providers show that even the most accurate
MariettaO [177]

Answer:

a. 11.26 % b. 6.76 %. It appears so since 6.76 % ≠ 15 %

Step-by-step explanation:

a. This is a binomial probability.

Let q = probability of giving out wrong number = 15 % = 0.15

p = probability of not giving out wrong number = 1 - q = 1 - 0.15 = 0.75

For a binomial probability, P(x) = ⁿCₓqˣpⁿ⁻ˣ. With n = 10 and x = 1, the probability of getting a number wrong P(x = 1) = ¹⁰C₁q¹p¹⁰⁻¹

= 10(0.15)(0.75)⁹

= 1.5(0.0751)

= 0.1126

= 11.26 %

b. At most one wrong is P(x ≤ 1) = P(0) + P(1)

= ¹⁰C₀q⁰p¹⁰⁻⁰ + ¹⁰C₁q¹p¹⁰⁻¹

= 1 × 1 × (0.75)¹⁰ + 10(0.15)(0.75)⁹

= 0.0563 + 0.01126

= 0.06756

= 6.756 %

≅ 6.76 %

Since the probability of at most one wrong number i got P(x ≤ 1) = 6.76 % ≠ 15 % the original probability of at most one are not equal, it thus appears that the original probability of 15 % is wrong.

3 0
3 years ago
1. Find the area of the polygon
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Answer:

1. A = 40 units²

2. A = 72 units²

3. B) 45

Step-by-step explanation:

1.  This shape comprises 4 congruent triangles with base of 5 units and height of 5 units.

Area of a triangle = 1/2 x base x height

Therefore, area of polygon = 4(1/2 x 5 x 4)

                                             = 40 units²

2.  This shape comprises two pairs of congruent triangles.

Area of a triangle = 1/2 x base x height

Therefore, area of polygon = 2(1/2 x 2 x 6) + 2(1/2 x 10 x 6)

                                             = 72 units²

3.  Count the number of shaded squares:

9 + 8 + 7 + 6 + 5 + 4 + 3 + 2 + 1 = 45 units²

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Analyze the graph of the cube root function shown
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The function which can be transformed into different ways is the parent function.

On a coordinate plane, a cubic function approaches the x-axis in quadrant 2, crosses the y-axis at (0, 2), has an inflection point at (1, 4), and the goes through (2, 6).

The given function is

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On solving these three equations, we have

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Thus, value of h is 1, k is 4 and a is 2.

Learn more about parent function

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2 years ago
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