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3 years ago

I need to know what 7 x 4 is

Mathematics

1 answer:

Vesna [10]3 years ago

6 0

7 X 4 = 28 if it’s hard for you just add 7, 4 times

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A normal random variable with mean and standard deviationboth equal to 10 degrees Celsius. What is the probability that the temp

Korvikt [17]

Answer:

0.57142

Step-by-step explanation:

A normal random variable with mean and standard deviation both equal to 10 degrees Celsius. What is the probability that the temperature at a randomly chosen time will be less than or equal to 59 degrees Fahrenheit?

We are told that the Mean and Standard deviation = 10°C

We convert to Fahrenheit

(10°C × 9/5) + 32 = 50°F

Hence, we solve using z score formula

z = (x-μ)/σ, where

x is the raw score = 59 °F

μ is the population mean = 50 °F

σ is the population standard deviation = 50 °F

z = 59 - 50/50

z = 0.18

Probability value from Z-Table:

P(x ≤59) = 0.57142

The probability that the temperature at a randomly chosen time will be less than or equal to 59 degrees Fahrenheit

is 0.57142

4 0

3 years ago

Find the values of k for which y = kx + 1 is a tangent to the curve y = 2x^2 + x +3

Dominik [7]

K = 5 or k = 3
Hope it helps-,-

8 0

3 years ago

Divide £21 in ratio 3:4

xxMikexx [17]

3+4 = 7
so
21 / 7 3

3 x 3 = 9
3 x 4 = 12

answer
£21 in ratio 3:4 is £9:£12

3 0

4 years ago

Leah babysat on Saturday for 3 hours and earned $34.50. She babysat for a different family on Sunday for 4 hours and earned $42.

postnew [5]

Answer:

1.00

Step-by-step explanation:

$34.50 divided by 3 equal 11.50 and $42 divided 4 equal 10.50 subtract that and get 1.00 so leah earned a dollar more per hour

8 0

3 years ago

Read 2 more answers

A presidential candidate plans to begin her campaign by visiting the capitals in 4 of 42 states. What is the probability that sh

marissa [1.9K]

Answer:

P (She selects the route of four specific capitals) = $\frac{1}{2686320}=(3.7226)10^{-7}$

D. No,it is not practical to list all of the different possible routes because the number of possible permutations is very large.

Step-by-step explanation:

Let's start assuming that each route is equally likely to be chosen.

Assuming this, we can calculate P(A) where the event A is ''She selects the route of four specific capitals'' doing the following :

P(A) = Favourable cases in which the route of four specific capitals is selected / Total number of ways in 4 of 42 states

The favourable cases in which the route of four specific capitals is selected is equal to 1 .

For the denominator we need the permutation number of 4 in 42.

The permutation number is defined as :

$nPr=\frac{n!}{(n-r)!}$

$42P4=\frac{42!}{(42-4)!}=\frac{42!}{38!}=2686320$

The probability of event A is : $\frac{1}{2686320}=(3.7226)10^{-7}$

Finally for the other question : The option D is the correct because the number of possible permutations is 2686320 and is very large to be listed.

7 0

3 years ago