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3 years ago

A set of biology exam scores are normally distributed with a mean of 70 points and a standard deviation of 6

Mathematics

2 answers:

Maslowich3 years ago

8 0

Answer:

To two decimal places, we have 0.93

Step-by-step explanation:

We start by calculating the z-score

Mathematically;

z-score = (x-mean)/SD

here, x = 61

mean = 70 and SD = 6

So, we have ;

z-score = (61-70)/6

z-score = -9/6 = -1.5

So we want to calculate the probability of z > -1.5

We use the standard normal distribution table for this

The answer here according to the table is 0.93319

To 2 decimal places, this is 0.93

bezimeni [28]3 years ago

7 0

Answer:

.69

Step-by-step explanation:

Normalcdf (lower: 0, upper: 73, mean: 70, S.D.: 6) = .691462 --> .69

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what's the surface area of this square pyramid that has a base length of 5 inches and triangular faces that are 9 inches tall

Vadim26 [7]

The surface area of the square prism is 115 square inches

<h3>surface area of a pyramid</h3>

The surface area of a pyramid is equivalent to the sum of the faces of the pyramid

For the given square pyramid;

TSA = (5*5) + 4(1/2 * 9 * 5)

Simplify to have;

Surface area =25 + 4(45/2)

Surface area = 25 + 180/2

Surface area = 25. + 90

Surface area = 115 square inches

Hence the surface area of the square prism is 115 square inches

Learn more on surface area here: brainly.com/question/20771646

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7 0

2 years ago

At a store, Susan selected a pumpkin that weighed 35.2 ounces. Pumpkins cost $1.80 per pound. There are 16 ounces in 1 pound. Ho

Nat2105 [25]

$3.96 i think i just did the math

5 0

3 years ago

Ms. Rogers bought 4 bags of candies to make gift boxes for her family. Each bag contained 18 candies. She put an equal number of

alisha [4.7K]

Answer:

2 candies were left.

Step-by-step explanation:

Number of bags of candies = 4 bags

Number of candies in each bag = 18 candies

Total number of candies = $4(18)=72$

Ms. Rogers put an equal number of these candies into each of 7 gift boxes.

Divide 72 by 7

72 = 7(10) + 2

Here, remainder is 2.

So,

2 candies were left.

3 0

3 years ago

If the sum of Noor's age and Salma's age = 30, 3 years ago Noor's

Flura [38]

Answer:

Noor's age is 12 & Salma's age is 18

Step-by-step explanation:

Noor's age: N

Salma's age: S

$N+S=30$ : given

$N - 3 = \frac{S}{2}$ : given

$N = \frac{S}{2}+3$ : isolate "N"

$\frac{S}{2}+3 + S = 30$ : substitute the value of N for N to find the value of "S"

$\frac{S}{2} + S = 27$ : subtract 3 from both sides

$\frac{S}{2}*2 + S*2 = 27*2$ ≡ $S + 2S = 54$ : multiply both sides by 2

$3S = 54$ : add like values

$\frac{3S}{3} = \frac{54}{3}$ : divide both sides by 3

S = 18

now insert that value into the initial equation:

$N + 18 = 30$

$N = 12$ : subtract 18 from both sides

8 0

3 years ago

HELPPPPPPP

quester [9]

Answer:

It's A. (2, 0) and (0, -4)

3 0

2 years ago

Read 2 more answers