3 years ago

Help please I will give brainlest

Mathematics

1 answer:

Ilya [14]3 years ago

3 0

I'm thinking its a im not sure though since i just finished getting out of that unit

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While only 5% of babies have learned to walk but the adage of 10 months, 75% have learned to walk by 13 months of age. If the ag

zheka24 [161]

Answer:

Mean is 12.13 months

Standard deviation is 1.29

Step-by-step explanation:

We need to use z-score here

Let the mean of the distribution be a while the standard deviation be b

Mathematically;

z-score = (x-mean)/SD

We can obtain the probability from the z-score

Now, for the 10th month

The z-score for a probability of P = 0.05(5%)

Can be obtained from the standard normal distribution table and that is;

-1.645

Hence;

-1.645 = (10 - a)/b

-1.645 b = 10 - a

a = 10 + 1.645b ••••••(i)

For the 13 month, we have a proportion of 75%

The z-score corresponding to P(0.75) is = 0.674 from standard normal distribution table

Hence;

0.674 = (13-a)/b

0.674b = 13 - a

a = 13 - 0.674b. •••••(ii)

Now equate both a;

10 + 1.645b = 13 - 0.674b

13-10 = 1.645 b+ 0.674b

3 = 2.319b

b = 3/2.319

b = 1.294

So the mean a will be

10 + 1.645b = 10 + 1.645(1.294) = 10 + 2.13

So mean is 12.13

7 0

4 years ago

A cheetah can run at its top speed for about 25 seconds

Paraphin [41]

Answer:

wow that's so cool

Step-by-step explanation:

8 0

3 years ago

You and your friend hike to a waterfall that is 4 miles east of where you left your bikes. You then hike to a lookout point that

netineya [11]

Answer is 10.5 miles

I used Pythagorean theory to solve for the unknown distance from the waterfall to lookout point.
a^2 + b^2 = c^2
2^2 + 4^2 = c^2
20 = c^2
Take square root of both sides
4.47 = c
Rounded to 4.5 miles

Add 4 miles and 2 miles and 4.5 miles
10.5 miles total