All categories

2 years ago

Let X be a normal random variable with mean 40 and standard deviation 2. Find P(X < 28).

Mathematics

1 answer:

Vikki [24]2 years ago

5 0

Answer:

Step-by-step explanation:

Given :

Mean = 40 ; Standard deviation = 2

P(x < 28)

Obtain the Zscore :

Z = (x - mean) / standard deviation

P(Z < (28 - 40) / 2))

Z = (28 - 40) / 2

Z = - 12 / 2

Z = - 6

P(Z < - 6) = 0.000000

You might be interested in

Mr solomon can run 2 1/2 in 2 hours. how many miles can he run in 6 hour PLZ HELP!!

Marat540 [252]

Answer:

7 1/2

Step-by-step explanation:

2 1/2 times 3 is 7 1/2

6 0

2 years ago

Read 2 more answers

Please answer this in two minutes

BartSMP [9]

Answer: 43.25?

Step-by-step explanation:

6 0

2 years ago

Find f(5) if f(t) = ^6 – 3t – 4. A –6 B –2 C 14 D 6

Lera25 [3.4K]

What they said ^ I was just about to answer, but there’s popped up first lol

8 0

3 years ago

Can someone please help me with this problem!

Anna71 [15]

Answer:

11 yards

Step-by-step explanation:

The volume of a cone formula is:

$V=\frac{1}{3}\pi r^2 h$

Where V is the volume,

r is the radius (half of diameter)

h is the height

Given,

h = 15

V = 475.17

We find the radius (r) first by substituting given values:

$V=\frac{1}{3}\pi r^2 h\\475.17=\frac{1}{3}\pi r^2 (15)\\475.17=5\pi r^2\\r^2=30.25\\r=5.5$

The radius (r) is 5.5 yards

We need the diameter, which is DOUBLE THE RADIUS, so diameter would be:

Diameter = 5.5 * 2 = 11 yards

8 0

2 years ago

Determine whether the statement is sometimes, always, or never true. If ax+b-4=b and doesn’t equal 0 then x=4/a?

attashe74 [19]

Start with expression $ax+b-4=b.$

1. Separate terms - with x leave in left side, without x write in right side:

$ax=b-b+4,\\ \\ax=4.$

2. Divide the last expression by a ( $a\neq 0$ ):

$x=\dfrac{4}{a}.$

Answer: this statement is true when $a\neq 0$ .

4 0

2 years ago