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GarryVolchara [31]

2 years ago

14

Joe drives 20 mi-in 1/2 h. how Long Will it take him to derive 50 mi?

1 answer:

tiny-mole [99]2 years ago

7 0

An hour and 15 minutes. Since Joe is driving 20 miles per 1/2 hour that means he is driving 40 miles every hour. We still have 10 miles left and since 20 divided by 2 is ten you would simply cut the time it takes him to drive 20 miles in half making 15 minutes. Then you add the time it takes to drive 40 miles and 10 miles and that's how you get an hour and 15 minutes. Hope this made sense!

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Q6. (15 points) IQ examination scores of 500 members of a club are normally distributed with mean of 165 and SD of 15.

melamori03 [73]

Answer:

a) 0.8413

b) 421

c) $P_{95} = 189.675$

Step-by-step explanation:

We are given the following information in the question:

Mean, μ = 165

Standard Deviation, σ = 15

We are given that the distribution of IQ examination scores is a bell shaped distribution that is a normal distribution.

Formula:

$z_{score} = \displaystyle\frac{x-\mu}{\sigma}$

a) P(IQ scores at most 180)

P(x < 180)

$P( x < 180) = P( z < \displaystyle\frac{180 - 165}{15}) = P(z < 1)$

Calculation the value from standard normal z table, we have,

$P(x < 180) = 0.8413 = 84.13\%$

b) Number of the members of the club have IQ scores at most 180

n = 500

$\text{Members} = n\times \text{P(IQ scores at most 180)}\\= 500\times 0.8413\\=420.65 \approc 421$

c) P(X< x) = 0.95

We have to find the value of x such that the probability is 0.95

$P( X < x) = P( z < \displaystyle\frac{x - 165}{15})=0.95$

Calculation the value from standard normal z table, we have,

$P(z < 1.645) = 0.95$

$\displaystyle\frac{x - 165}{15} = 1.645\\\\x = 189.675$

$P_{95} = 189.675$

8 0

2 years ago

Could someone help me with this question? i don't know how to really work this out Order Of Operations

lozanna [386]

Answer:

10

Step-by-step explanation:

2[45/(11-8)^2]

=2[45/(3)^2]

=2[45/9]

=2[5]

=10

3 0

2 years ago

Could you plz help me on my hw

Korolek [52]

7. p=0.4
i dont know about 3
or 6

5 0

2 years ago

0.375 is an example of a terminating decimal.<br> True<br> False<br><br> HELP

igor_vitrenko [27]

Answer:

True

Step-by-step explanation:

the decimal does not continue further making it a terminating decimal

5 0

2 years ago

Read 2 more answers

There 400 members at the school band. Of those, 220 were girls. Expressed as a percentage, how many more girls than boys were th

GuDViN [60]

220/400 = 55%
100%- 55% = 45%
there were 45% more girls than there were boys.

3 0

2 years ago