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I need to find the standard deviation of one of my columns

I need to chart expected returns on a vertical axis and standard deviation on the horizontal axis, but the chart insert separate lines for the returns and standard deviations.

I need a contingency table that shows the average and standard deviation across different age groups given that each person's income is given in a different form either daily, monthly, hourly or others. ( The table contains around 45000 values)

compare the z scores fo rthe following raw scores where x=50 and the standard deviation =-5.

distribution of scores with x= 75 and standard deviation =6.38. what is the probability of a score falling between a raw score of 70 and 80 question 6a p217

Hi, I'm trying to produce a bar chart with standard deviation error bars using the values I've calculated. Whenever I insert the chart the axis scale is way off and when I try to change the error bar values to my stdev values it says my formula is incorrect.

A distriubution of sores with x=75 and standard deviation =6.38. What is the probability of a score falling below a raw score of 63? (problem 6d

According to the National Center for Health Statistics, the mean height of an American male is 69.3 inches and the mean height of an American female is 63.8 inches. The standard deviation for both genders is 2.7 inches. •According to Chebyshev’s Theorem 75% of the data for your gender lies between what two heights? •If height is assumed to be normal, what percentage of the data lies between those same two heights?

1. departments use exams as part of their promotion process where officers have to score higher than 80% of those taking the exam to be considered for promotion. (This is a z-score of 0.83 or above). Two officers write their exams. officer #1 receives a grade of 70 and officer #2 receives a grade of 72. Note that the mean (of all officers taking the exam is) is 62 and the standard deviation is 11. (20pts) a. Calculate the z-score for officer #1. Was this score high enough to be considered for promotion? b. Calculate the z-score for officer #2. Was this score high enough to be considered for promotion?

The length of time it takes to find a parking space at 9 A.M. follows a normal distribution with a mean of 4 minutes and a standard deviation of 2 minutes. Find the probability that it takes at least 8 minutes to find a parking space.