Mean change from data set edits practice

A weather station records five daily rainfall amounts, in inches: $1$, $2$, $3$, $4$, and $5$. The lowest amount, $1$ inch, is removed from the data set. How does this affect the mean?

A runner logs five lap times, in seconds: $18$, $20$, $22$, $24$, and $26$. A sixth lap time of $16$ seconds is added to the data set. How does this affect the mean?

A biologist measures five plant heights, in inches: $58$, $60$, $62$, $64$, and $66$. The tallest plant, $66$ inches, is removed from the data set. How does this affect the mean?

A bookstore tracks five daily sales totals, in dollars: $10$, $15$, $20$, $25$, and $30$. A sixth day with sales of $20$ is added to the data set. How does this affect the mean?

A student logs five daily page counts: $20$, $25$, $30$, $35$, and $40$. A sixth day with $45$ pages read is added to the data set. How does this affect the mean?

A shipping clerk weighs five packages at $50$, $55$, $60$, $65$, and $70$ pounds. The $70$-pound package is removed from the data set. How does this affect the mean?

A cyclist records five ride distances, in miles: $12$, $15$, $18$, $21$, and $24$. Another ride distance is added to the data set, but its length is not given. How does this affect the mean?

Five test scores are $70$, $78$, $84$, $90$, and $96$. One score is removed from the data set, but which score was removed is not stated. How does this affect the mean?