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Sliva [168]
3 years ago
15

What is your hart rate if you count 18 beats in 15 seconds

Mathematics
1 answer:
inna [77]3 years ago
4 0

Answer:

Your heart rate would be 72 beats per minute

Step-by-step explanation:

You need to get 60 minutes so If you multiply 15 by 4, its 60. Do the same for 18 and your heart rate is 72 beats per minute

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The 20 to 34 age groups are approximately normally distributed with µ = 110
Savatey [412]

Answer:

21.94% of people aged 20 to 34 have IQs between 125 and 150.

Step-by-step explanation:

<u>The complete question is:</u> Scores on the Wechsler Adult Intelligence Scale (a standard IQ test) for the 20 to 34 age group are approximately Normally distributed with  μ = 110  and  σ = 25.

What percent of people aged 20 to 34 have IQs between 125 and 150?

Let X = <u><em>Scores on the standard IQ test for the 20 to 34 age group</em></u>

SO, X ~ Normal(\mu=110,\sigma^{2} =25^{2})

The z-score probability distribution for the normal distribution is given by;

                            Z  =  \frac{X-\mu}{\sigma}  ~ N(0,1)

where, \mu = population mean = 110

            \sigma = standard deviation = 25

Now, the percent of people aged 20 to 34 have IQs between 125 and 150 is given by = P(125 < X < 150) = P(X < 150) - P(X \leq 125)

       P(X < 150) = P( \frac{X-\mu}{\sigma} < \frac{150-110}{25} ) = P(Z < 1.60) = 0.9452

       P(X \leq 125) = P( \frac{X-\mu}{\sigma} \leq \frac{125-110}{25} ) = P(Z \leq 0.60) = 0.7258

The above probability is calculated by looking at the value of x = 1.60 and x = 0.60 which has an area of 0.9452 and 0.7258.

Therefore, P(125 < X < 150) = 0.9452 - 0.7258 = 0.2194 or 21.94%

7 0
3 years ago
GIVE BRAINLIEST:) please help i dont really understand this?
kolbaska11 [484]

Answer: Answer is B

Step-by-step explanation:

4 0
2 years ago
Read 2 more answers
3 to the power of 2 + (15 ÷ 5 × 6) − 49
grin007 [14]

Answer:

i think its -31

Step-by-step explanation:

thats what i got

hope this helps :)

7 0
2 years ago
Read 2 more answers
PLEASE HELP ASAP!!! CORRECT ANSWER ONLY PLEASE!!! I CANNOT RETAKE THIS!!
Rashid [163]

x =  \frac{ -2 \pm \:  \sqrt{ {2}^{2} - 4 \times 1 \times 10 }  }{2}  \\  \\ x =  \frac{ - 2 \pm 6i}{2}  \\  \\  \boxed{ \red{ \huge{x =  - 1 \pm \: 3i}}}

\boxed{ \red{ \huge{answer = d}}}
3 0
3 years ago
Rico can walk 3 miles in the same amount of time that Donna can walk 2 miles. Rico walks at a rate 2 miles per hour faster than
tatyana61 [14]

Answer:

13

Step-by-step explanation:

Donna's Rate is R

Rico's Rate is R+2

\frac{R}{R+2}=\frac{2}{3}

Cross-Multiply

2(R+2)=32

2R+4=3R

4=R

Donna's Rate is R=4

Rico's Rate is R+2=6

\frac{6(130)}{60} = \frac{130}{10}=13

5 0
2 years ago
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