Please give me a full correct answer WITH EXPLANATION!!! An ecological group suspects dolphins are consuming dangerous levels of arsenic in a region of the world. Dangerous levels of arsenic are classified when they reach beyond 7.0 parts per million. A random sample of 28 dolphins in the region were tested and the data is shown in the stemplot.

Stemplot for Arsenic Levels. 2|4; 2|; 3|2 3; 3|6 7 9; 4|0 1 3; 4|5 7 7; 5|0 1 1 4 4; 5|7 8; 6|3 4; 6|6; 7|0 1 3; 7|5 6 7.

Key: 2|4 = 2.4 parts per million

Part A: What proportion of the dolphins in the sample have dangerous levels of arsenic in their systems? (4 points)

Part B: Construct and interpret a 99% confidence interval for the mean arsenic levels of the dolphins if the sample of 28 dolphins has a mean arsenic level of 5.26 parts per million and standard deviation of 1.49 parts per million. (6 points)

300pi

step-by-step explanation:

step-by-step explanation:

6.48/4 4 goes into 6.48 1.62 times

d. 24+-0.114

step-by-step explanation:

the question requires us to calculate the approximate 95% confidence interval for the mean number of ounces of ketchup per bottle in the sample given the following statistics;

sample mean = 24

standard deviation, σ = 0.4

sample size , n = 49

the confidence interval for a population mean is calculated using the formula;

sample mean ± z-score*(σ/sqrt(n))

the z-score associated with a 95% confidence interval, from the standard normal tables, is;

1.96

substituting these values into the formula;

24 ± 1.96*(0.4/7)

= 24 ± 0.112

from the alternatives given, choice d is closest to the above expression;

the rocket cannot penetrate the ground, in a contextual sense, therefore the roots of this equation should be the domain of this function. i'll let you find the roots of this quadratic equation (hint: use the quadratic formula:  

1- c

2-a

step-by-step explanation:

mark brainliest!